Modern fixes (#697)

include/gba/m4a_internal.h

@@ -170,7 +170,11 @@ struct SoundChannel
 
 struct MusicPlayerInfo;
 
+#if __STDC_VERSION__ < 202311L
 typedef void (*MPlayFunc)();
+#else
+typedef void (*MPlayFunc)(...);
+#endif
 typedef void (*PlyNoteFunc)(u32, struct MusicPlayerInfo *, struct MusicPlayerTrack *);
 typedef void (*CgbSoundFunc)(void);
 typedef void (*CgbOscOffFunc)(u8);