Fixes for C23 Support (#2138)

* fixes for c23 support
* include global.h in m4a.c & remove <string.h> include

include/gba/m4a_internal.h

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

include/global.h

@@ -23,6 +23,10 @@
 #define asm_unified(x) asm(".syntax unified\n" x "\n.syntax divided")
 #define NAKED __attribute__((naked))
 
+#if MODERN
+#define asm __asm__
+#endif
+
 /// IDE support
 #if defined(__APPLE__) || defined(__CYGWIN__) || defined(__INTELLISENSE__)
 // We define these when using certain IDEs to fool preproc

include/librfu.h

@@ -316,7 +316,11 @@ struct STWIStatus
     u8 recoveryCount;
     u8 unk_16;
     u8 unk_17;
+#if !MODERN
     void (*callbackM)();
+#else
+    void (*callbackM)(...);
+#endif
     void (*callbackS)(u16);
     void (*callbackID)(void);
     union RfuPacket *txPacket;