[RAYMATH] Revert Extern 'C' in raymath (#3985)

* Update raylib_api.* by CI

* Remove Extern C for raymath, it breaks some cases in mingw-w64 and does not fix any warning issues.

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: JeffM2501

src/raymath.h

@@ -78,10 +78,6 @@
 #endif
 
 
-#if defined(__cplusplus)
-extern "C" {            // Prevents name mangling of functions
-#endif
-
 //----------------------------------------------------------------------------------
 // Defines and Macros
 //----------------------------------------------------------------------------------
@@ -2528,8 +2524,5 @@ RMAPI int QuaternionEquals(Quaternion p, Quaternion q)
 
     return result;
 }
-#if defined(__cplusplus)
-}
-#endif
 
 #endif  // RAYMATH_H