turn off c++ symbol mangling for GetGameAPI/vmMain/dllEntry

code/cgame/cg_main.cpp

@@ -92,6 +92,7 @@ This is the only way control passes into the cgame module.
 This must be the very first function compiled into the .q3vm file
 ================
 */
+extern "C" {
 int vmMain( int command, int arg0, int arg1, int arg2, int arg3, int arg4, int arg5, int arg6, int arg7 ) {
 	centity_t		*cent;
 
@@ -175,6 +176,7 @@ Ghoul2 Insert End
 	}
 	return -1;
 }
+} // extern "C"
 
 /*
 Ghoul2 Insert Start

code/cgame/cg_syscalls.cpp

@@ -27,6 +27,7 @@ extern void CG_PreInit();
 
 static int (*qsyscall)( int arg, ... ) = (int (*)( int, ...))-1;
 
+extern "C" {
 #ifdef _XBOX
 void cg_dllEntry( int (*syscallptr)( int arg,... ) ) {
 #else
@@ -35,6 +36,7 @@ void dllEntry( int (*syscallptr)( int arg,... ) ) {
 	qsyscall = syscallptr;
 	CG_PreInit();
 }
+} // extern "C"
 
 
 inline int PASSFLOAT( float x ) {

code/game/g_main.cpp

@@ -872,6 +872,7 @@ and global variables
 =================
 */
 extern int PM_ValidateAnimRange( const int startFrame, const int endFrame, const float animSpeed );
+extern "C" {
 game_export_t *GetGameAPI( game_import_t *import ) {
 	gameinfo_import_t	gameinfo_import;
 
@@ -915,6 +916,7 @@ game_export_t *GetGameAPI( game_import_t *import ) {
 
 	return &globals;
 }
+} // extern "C"
 
 void QDECL G_Error( const char *fmt, ... ) {
 	va_list		argptr;

code/ui/ui_syscalls.cpp

@@ -15,10 +15,12 @@
 
 static int (*qsyscall)( int arg, ... ) = (int (*)( int, ...))-1;
 
+extern "C" {
 void dllEntry( int (*syscallptr)( int arg,... ) ) {
 	qsyscall = syscallptr;
 //	CG_PreInit();
 }
+} // extern "C"
 
 inline int PASSFLOAT( float x ) 
 {