Don't treat some platforms as Unix.

miniaudio.h

@@ -6217,7 +6217,7 @@ This section contains the APIs for device playback and capture. Here is where yo
         #define MA_SUPPORT_JACK    /* JACK is technically supported on Windows, but I don't know how many people use it in practice... */
     #endif
 #endif
-#if defined(MA_UNIX)
+#if defined(MA_UNIX) && !defined(MA_ORBIS) && !defined(MA_PROSPERO)
     #if defined(MA_LINUX)
         #if !defined(MA_ANDROID)   /* ALSA is not supported on Android. */
             #define MA_SUPPORT_ALSA