remove obsolete enum values MUS_MODPLUG_UNUSED and MUS_MP3_MAD_UNUSED.

Author: sezero

examples/playmus.c

@@ -223,7 +223,6 @@ int main(int argc, char *argv[])
             typ = "WAV";
             break;
         case MUS_MOD:
-        case MUS_MODPLUG_UNUSED:
             typ = "MOD";
             break;
         case MUS_FLAC:
@@ -236,7 +235,6 @@ int main(int argc, char *argv[])
             typ = "OGG Vorbis";
             break;
         case MUS_MP3:
-        case MUS_MP3_MAD_UNUSED:
             typ = "MP3";
             break;
         case MUS_OPUS:

include/SDL3_mixer/SDL_mixer.h

@@ -219,9 +219,7 @@ typedef enum Mix_MusicType {
     MUS_MID,
     MUS_OGG,
     MUS_MP3,
-    MUS_MP3_MAD_UNUSED,
     MUS_FLAC,
-    MUS_MODPLUG_UNUSED,
     MUS_OPUS,
     MUS_WAVPACK,
     MUS_GME