Fix -Wundef warnings due to use of unguarded SDL_AUDIO_DRIVER_OPENSLES

src/audio/SDL_audio.c

@@ -61,7 +61,7 @@ static const AudioBootStrap *const bootstrap[] = {
 #ifdef SDL_AUDIO_DRIVER_AAUDIO
     &aaudio_bootstrap,
 #endif
-#if SDL_AUDIO_DRIVER_OPENSLES
+#ifdef SDL_AUDIO_DRIVER_OPENSLES
     &openslES_bootstrap,
 #endif
 #if SDL_AUDIO_DRIVER_ANDROID

src/audio/openslES/SDL_openslES.c

@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if SDL_AUDIO_DRIVER_OPENSLES
+#ifdef SDL_AUDIO_DRIVER_OPENSLES
 
 /* For more discussion of low latency audio on Android, see this:
    https://googlesamples.github.io/android-audio-high-performance/guides/opensl_es.html

src/video/android/SDL_androidevents.c

@@ -39,7 +39,7 @@ static void ANDROIDAUDIO_ResumeDevices(void) {}
 static void ANDROIDAUDIO_PauseDevices(void) {}
 #endif
 
-#if !defined(SDL_AUDIO_DISABLED) && SDL_AUDIO_DRIVER_OPENSLES
+#if !defined(SDL_AUDIO_DISABLED) && defined(SDL_AUDIO_DRIVER_OPENSLES)
 extern void openslES_ResumeDevices(void);
 extern void openslES_PauseDevices(void);
 #else