Updated for the SDL3 RW -> IO changes

[slouken]

Fixes #597

[sezero]

All CreateFromRW needs changing to CreateFromIO

music_wavpack.c has freesrc2 along with freesrc: freesrc2 needs changing to closeio2

music_flac.c has typos / copy/paste mistakes:

../src/codecs/music_flac.c: In function ‘flac_read_music_cb’:
../src/codecs/music_flac.c:201:22: error: dereferencing pointer to incomplete type ‘SDL_IOStream’ {aka ‘struct SDL_IOStream’}
  201 |         if (data->src->status == SDL_IOOPS_STATUS_READY ||
      |                      ^~
../src/codecs/music_flac.c:201:34: error: ‘SDL_IOOPS_STATUS_READY’ undeclared (first use in this function); did you mean ‘SDL_IO_STATUS_READY’?
  201 |         if (data->src->status == SDL_IOOPS_STATUS_READY ||
      |                                  ^~~~~~~~~~~~~~~~~~~~~~
      |                                  SDL_IO_STATUS_READY
../src/codecs/music_flac.c:201:34: note: each undeclared identifier is reported only once for each function it appears in
../src/codecs/music_flac.c:202:34: error: ‘SDL_IOOPS_STATUS_NOT_READY’ undeclared (first use in this function); did you mean ‘SDL_IO_STATUS_NOT_READY’?
  202 |             data->src->status == SDL_IOOPS_STATUS_NOT_READY) {
      |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                  SDL_IO_STATUS_NOT_READY
../src/codecs/music_flac.c:204:41: error: ‘SDL_IOOPS_STATUS_EOF’ undeclared (first use in this function); did you mean ‘SDL_IO_STATUS_EOF’?
  204 |         } else if (data->src->status == SDL_IOOPS_STATUS_EOF) {
      |                                         ^~~~~~~~~~~~~~~~~~~~
      |                                         SDL_IO_STATUS_EOF
../src/codecs/music_flac.c:212:1: error: control reaches end of non-void function [-Werror=return-type]
  212 | }
      | ^

stb_vorbis.h has helper procedure names with rwops

native_midi_haiku.cpp not updated

native_midi_macosx.c has freesrc which needs changing to closeio and has procedure names with _RW

There may be more..

[slouken]

Thanks for the review. I fixed the things you found and did one last look around and I think you caught everything. It looks like CI is succeeding, can you take one last look as a sanity check?

[sezero]

Final nits below. (If you have a better cmdline switch replacement for -rwops of playmus, be my guest)

diff --git a/examples/playmus.c b/examples/playmus.c
index aebf9e5..0f66317 100644
--- a/examples/playmus.c
+++ b/examples/playmus.c
@@ -65,3 +65,3 @@ static void Usage(char *argv0)
 {
-    SDL_Log("Usage: %s [-i] [-l] [-8] [-f32] [-r rate] [-c channels] [-b buffers] [-v N] [-rwops] <musicfile>\n", argv0);
+    SDL_Log("Usage: %s [-i] [-l] [-8] [-f32] [-r rate] [-c channels] [-b buffers] [-v N] [-iostr] <musicfile>\n", argv0);
 }
@@ -117,3 +117,3 @@ int main(int argc, char *argv[])
     int interactive = 0;
-    int rwops = 0;
+    int iostr = 0;
     int i;
@@ -167,4 +167,4 @@ int main(int argc, char *argv[])
         } else
-        if (SDL_strcmp(argv[i], "-rwops") == 0) {
-            rwops = 1;
+        if (SDL_strcmp(argv[i], "-iostr") == 0) {
+            iostr = 1;
         } else {
@@ -213,3 +213,3 @@ int main(int argc, char *argv[])
         /* Load the requested music file */
-        if (rwops) {
+        if (iostr) {
             music = Mix_LoadMUS_IO(SDL_IOFromFile(argv[i], "rb"), SDL_TRUE);
diff --git a/include/SDL3_mixer/SDL_mixer.h b/include/SDL3_mixer/SDL_mixer.h
index b7ece3e..9989d20 100644
--- a/include/SDL3_mixer/SDL_mixer.h
+++ b/include/SDL3_mixer/SDL_mixer.h
@@ -402,5 +402,5 @@ extern DECLSPEC int SDLCALL Mix_AllocateChannels(int numchans);
  *
- * If `closeio` is SDL_TRUE, the RWops will be closed before returning,
+ * If `closeio` is SDL_TRUE, the IOStream will be closed before returning,
  * whether this function succeeds or not. SDL_mixer reads everything it needs
- * from the RWops during this call in any case.
+ * from the IOStream during this call in any case.
  *
@@ -451,3 +451,3 @@ extern DECLSPEC Mix_Chunk * SDLCALL Mix_LoadWAV_IO(SDL_IOStream *src, SDL_bool c
  * Note that before SDL_mixer 3.0.0, this function was a macro that called
- * Mix_LoadWAV_IO(), creating a RWops and setting `closeio` to SDL_TRUE. This
+ * Mix_LoadWAV_IO(), creating a IOStream and setting `closeio` to SDL_TRUE. This
  * macro has since been promoted to a proper API function. Older binaries
@@ -515,5 +515,5 @@ extern DECLSPEC Mix_Music * SDLCALL Mix_LoadMUS(const char *file);
  *
- * If `closeio` is SDL_TRUE, the RWops will be closed before returning,
+ * If `closeio` is SDL_TRUE, the IOStream will be closed before returning,
  * whether this function succeeds or not. SDL_mixer reads everything it needs
- * from the RWops during this call in any case.
+ * from the IOStream during this call in any case.
  *
@@ -575,5 +575,5 @@ extern DECLSPEC Mix_Music * SDLCALL Mix_LoadMUS_IO(SDL_IOStream *src, SDL_bool c
  *
- * If `closeio` is SDL_TRUE, the RWops will be closed before returning,
+ * If `closeio` is SDL_TRUE, the IOStream will be closed before returning,
  * whether this function succeeds or not. SDL_mixer reads everything it needs
- * from the RWops during this call in any case.
+ * from the IOStream during this call in any case.
  *