Revert "Workaround for compiling with MinGW-w64"

This reverts commit efdf43aa9b4f4d623ffba01f503d9793d5021330.

The broken mingw headers aren't in an official release yet, so reporting this upstream.

src/joystick/windows/SDL_windows_gaming_input.c

@@ -34,11 +34,6 @@
 #include <cfgmgr32.h>
 #include <roapi.h>
 
-#ifdef __MINGW32__
-#define __FIReference_1_int __FIReference_1_INT32
-#define __FIReference_1_int_get_Value __FIReference_1_INT32_get_Value
-#define __FIReference_1_int_Release __FIReference_1_INT32_Release
-#endif
 
 struct joystick_hwdata
 {