dummy audio: Patched to compile.

src/audio/dummy/SDL_dummyaudio.c

@@ -22,6 +22,7 @@
 
 /* Output audio to nowhere... */
 
+#include "SDL_timer.h"
 #include "SDL_audio.h"
 #include "../SDL_audio_c.h"
 #include "SDL_dummyaudio.h"
@@ -36,7 +37,7 @@ static int
 DUMMYAUD_CaptureFromDevice(_THIS, void *buffer, int buflen)
 {
     /* Delay to make this sort of simulate real audio input. */
-    SDL_Delay((device->spec.samples * 1000) / device->spec.freq);
+    SDL_Delay((this->spec.samples * 1000) / this->spec.freq);
 
     /* always return a full buffer of silence. */
     SDL_memset(buffer, this->spec.silence, buflen);