[libs] Fix some c23 build errors for mxe

libs/gib/regex.c

@@ -4619,8 +4619,7 @@ re_compile_pattern (
 static struct re_pattern_buffer re_comp_buf;
 
 const char *
-re_comp (s)
-    const char *s;
+re_comp (const char *s)
 {
   reg_errcode_t ret;
 
@@ -4657,8 +4656,7 @@ re_comp (s)
 
 
 int
-re_exec (s)
-    const char *s;
+re_exec (const char *s)
 {
   const int len = strlen (s);
   return

libs/ruamoko/pr_cmds.c

@@ -548,12 +548,6 @@ PF_charcount (progs_t *pr, void *data)
 	R_FLOAT (pr) = count;
 }
 
-#if (INT_MAX == 2147483647) && (INT_MIN == -2147483648)
-# define INT_WIDTH 11
-#else /* I hope... */
-# define INT_WIDTH 20
-#endif
-
 /*
 	string () gametype
 */

libs/util/fnmatch.c

@@ -54,10 +54,7 @@
 /* Match STRING against the filename pattern PATTERN, returning zero if
    it matches, nonzero if not.  */
 int
-fnmatch (pattern, string, flags)
-const char *pattern;
-const char *string;
-int         flags;
+fnmatch (const char *pattern, const char *string, int flags)
 {
 	register const char *p = pattern, *n = string;
 	register unsigned char c;