Restore old check for forceinline in stb_vorbis to fix MinGW build.

Source/ThirdParty/STB/stb_vorbis.c

@@ -179,7 +179,7 @@
 #define NULL 0
 #endif
 
-#if !defined(_MSC_VER) && !(defined(__MINGW32__) && defined(__forceinline))
+#ifndef _MSC_VER
    #if __GNUC__
       #define __forceinline inline
    #else