Removed SDL_bool in favor of plain bool

We require stdbool.h in the build environment, so we might as well use the plain bool type.

If your environment doesn't have stdbool.h, this simple replacement will suffice:
typedef signed char bool;

test/testaudioinfo.c

@@ -14,7 +14,7 @@
 #include <SDL3/SDL_test.h>
 
 static void
-print_devices(SDL_bool recording)
+print_devices(bool recording)
 {
     SDL_AudioSpec spec;
     const char *typestr = (recording ? "recording" : "playback");
@@ -88,8 +88,8 @@ int main(int argc, char **argv)
 
     SDL_Log("Using audio driver: %s\n\n", SDL_GetCurrentAudioDriver());
 
-    print_devices(SDL_FALSE);
-    print_devices(SDL_TRUE);
+    print_devices(false);
+    print_devices(true);
 
     if (SDL_GetAudioDeviceFormat(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, &frames)) {
         SDL_Log("Default Playback Device:\n");