Style: Replace header guards with #pragma once

core/math/math_funcs.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef MATH_FUNCS_H
-#define MATH_FUNCS_H
+#pragma once
 
 #include "core/error/error_macros.h"
 #include "core/math/math_defs.h"
@@ -758,5 +757,3 @@ public:
 		return p_target;
 	}
 };
-
-#endif // MATH_FUNCS_H