- Modernise function declarations in Cephis C math to address ongoing GCC and Clang warnings.

Examples:

/home/mrichters/Repos/Raze/source/common/thirdparty/math/exp.c: In function ‘c_exp’:
/home/mrichters/Repos/Raze/source/common/thirdparty/math/exp.c:171:48: warning: declaration of built-in function ‘floor’ without a prototype; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
  171 | double polevl(double, void *, int), floor(), ldexp();
      |                                                ^~~~~
/home/mrichters/Repos/Raze/source/common/thirdparty/math/exp.c:171:57: warning: declaration of built-in function ‘ldexp’ without a prototype; expected ‘double(double,  int)’ [-Wbuiltin-declaration-mismatch]
  171 | double polevl(double, void *, int), floor(), ldexp();

/home/mrichters/Repos/Raze/source/common/thirdparty/math/exp.c:200:16: warning: passing arguments to 'polevl' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
px = x * polevl( xx, P, 2 );
               ^
/home/mrichters/Repos/Raze/source/common/thirdparty/math/exp.c:201:17: warning: passing arguments to 'polevl' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
x =  px/( polevl( xx, Q, 3 ) - px );
                ^
/home/mrichters/Repos/Raze/source/common/thirdparty/math/exp.c:167:8: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
double c_exp(x)
       ^
3 warnings generated.

source/common/thirdparty/math/asin.c

@@ -276,8 +276,7 @@ double c_asin();
 #endif
 extern double PIO2, PIO4, NAN;
 
-double c_asin(x)
+double c_asin(double x)
-double x;
 {
 double a, p, z, zz;
 short sign;
@@ -327,8 +326,7 @@ return(z);
 
 
 
-double c_acos(x)
+double c_acos(double x)
-double x;
 {
 if( (x < -1.0) || (x > 1.0) )
 	{

source/common/thirdparty/math/atan.c

@@ -212,8 +212,7 @@ extern double PI, PIO2, PIO4, INFINITY, NEGZERO, MAXNUM;
 #endif
 
 
-double c_atan(x)
+double c_atan(double x)
-double x;
 {
 double y, z;
 short sign, flag;
@@ -269,11 +268,10 @@ return(y);
 /*							atan2	*/
 
 #ifdef ANSIC
-double c_atan2( y, x )
+double c_atan2(double y, double x)
 #else
-double c_atan2( x, y )
+double c_atan2(double x, double y)
 #endif
-double x, y;
 {
 double z, w;
 short code;

source/common/thirdparty/math/cosh.c

@@ -79,8 +79,7 @@ int isnan(), isfinite();
 #endif
 extern double MAXLOG, INFINITY, LOGE2;
 
-double c_cosh(x)
+double c_cosh(double x)
-double x;
 {
 double y;
 

source/common/thirdparty/math/exp.c

@@ -164,12 +164,11 @@ static short sc2[] = {0x3eb7,0xf7d1,0xcf79,0xabca};
 
 extern double LOGE2, LOG2E, MAXLOG, MINLOG, MAXNUM;
 
-double c_exp(x)
+double c_exp(double x)
-double x;
 {
 double px, xx;
 int n;
-double polevl(), floor(), ldexp();
+double polevl(double, void *, int), floor(double), ldexp(double, int);
 
 if( x > MAXLOG)
 	{

source/common/thirdparty/math/isnan.c

@@ -99,8 +99,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 /* Return 1 if the sign bit of x is 1, else 0.  */
 
-int signbit(x)
+int signbit(double x)
-double x;
 {
 union
 	{
@@ -140,8 +139,7 @@ else
 
 /* Return 1 if x is a number that is Not a Number, else return 0.  */
 
-int isnan(x)
+int isnan(double x)
-double x;
 {
 #ifdef NANS
 union
@@ -209,8 +207,7 @@ return(0);
 
 /* Return 1 if x is not infinite and is not a NaN.  */
 
-int isfinite(x)
+int isfinite(double x)
-double x;
 {
 #ifdef INFINITIES
 union

source/common/thirdparty/math/log.c

@@ -230,8 +230,7 @@ int isnan(), isfinite();
 #define SQRTH 0.70710678118654752440
 extern double INFINITY, NAN;
 
-double c_log(x)
+double c_log(double x)
-double x;
 {
 int e;
 #ifdef DEC

source/common/thirdparty/math/log10.c

@@ -178,8 +178,7 @@ int isnan(), isfinite();
 #endif
 extern double LOGE2, SQRT2, INFINITY, NAN;
 
-double c_log10(x)
+double c_log10(double x)
-double x;
 {
 VOLATILE double z;
 double y;

source/common/thirdparty/math/mtherr.c

@@ -99,9 +99,7 @@ static char *ermsg[7] = {
 };
 
 
-int mtherr( name, code )
+int mtherr(char* name, int code)
-char *name;
-int code;
 {
 
 /* Display string passed by calling program,

source/common/thirdparty/math/polevl.c

@@ -75,10 +75,7 @@ Direct inquiries to 30 Frost Street, Cambridge, MA 02140
 */
 
 
-double polevl( x, coef, N )
+double polevl(double x, double coef[], int N)
-double x;
-double coef[];
-int N;
 {
 double ans;
 int i;
@@ -101,10 +98,7 @@ return( ans );
  * Otherwise same as polevl.
  */
 
-double p1evl( x, coef, N )
+double p1evl(double x, double coef[], int N)
-double x;
-double coef[];
-int N;
 {
 double ans;
 double *p;

source/common/thirdparty/math/pow.c

@@ -387,8 +387,7 @@ extern double NAN;
 extern double NEGZERO;
 #endif
 
-double c_pow( x, y )
+double c_pow(double x, double y)
-double x, y;
 {
 double w, z, W, Wa, Wb, ya, yb, u;
 /* double F, Fa, Fb, G, Ga, Gb, H, Ha, Hb */
@@ -768,8 +767,7 @@ return( z );
 
 
 /* Find a multiple of 1/16 that is within 1/16 of x. */
-static double reduc(x)
+static double reduc(double x)
-double x;
 {
 double t;
 

source/common/thirdparty/math/powi.c

@@ -78,9 +78,7 @@ int signbit();
 #endif
 extern double NEGZERO, INFINITY, MAXNUM, MAXLOG, MINLOG, LOGE2;
 
-double c_powi( x, nn )
+double c_powi(double x, int nn)
-double x;
-int nn;
 {
 int n, e, sign, asign, lx;
 double w, y, s;

source/common/thirdparty/math/sin.c

@@ -238,8 +238,7 @@ extern double INFINITY;
 #endif
 
 
-double c_sin(x)
+double c_sin(double x)
-double x;
 {
 double y, z, zz;
 int j, sign;
@@ -318,8 +317,7 @@ return(y);
 
 
 
-double c_cos(x)
+double c_cos(double x)
-double x;
 {
 double y, z, zz;
 int i;
@@ -403,8 +401,7 @@ static unsigned short P648[] = {034513,054170,0176773,0116043,};
 static double P64800 = 4.8481368110953599358991410e-5;
 #endif
 
-double radian(d,m,s)
+double radian(double d, double m, double s)
-double d,m,s;
 {
 
 return( ((d*60.0 + m)*60.0 + s)*P64800 );

source/common/thirdparty/math/sinh.c

@@ -132,8 +132,7 @@ double fabs(), c_exp(), polevl(), p1evl();
 #endif
 extern double INFINITY, MINLOG, MAXLOG, LOGE2;
 
-double c_sinh(x)
+double c_sinh(double x)
-double x;
 {
 double a;
 

source/common/thirdparty/math/sqrt.c

@@ -78,8 +78,7 @@ double frexp(), ldexp();
 #endif
 extern double SQRT2;  /*  _sqrt2 = 1.41421356237309504880 */
 
-double c_sqrt(x)
+double c_sqrt(double x)
-double x;
 {
 int e;
 #ifndef UNK

source/common/thirdparty/math/tan.c

@@ -220,8 +220,7 @@ extern double PIO4;
 extern double INFINITY;
 extern double NAN;
 
-double c_tan(x)
+double c_tan(double x)
-double x;
 {
 #ifdef MINUSZERO
 if( x == 0.0 )
@@ -240,8 +239,7 @@ return( tancot(x,0) );
 }
 
 
-double c_cot(x)
+double c_cot(double x)
-double x;
 {
 
 if( x == 0.0 )
@@ -253,9 +251,7 @@ return( tancot(x,1) );
 }
 
 
-static double tancot( xx, cotflg )
+static double tancot(double xx, int cotflg)
-double xx;
-int cotflg;
 {
 double x, y, z, zz;
 int j, sign;

source/common/thirdparty/math/tanh.c

@@ -128,8 +128,7 @@ double fabs(), c_exp(), polevl(), p1evl();
 #endif
 extern double MAXLOG;
 
-double c_tanh(x)
+double c_tanh(double x)
-double x;
 {
 double s, z;