sun audio: remove ifdefs, always include sys/audioio.h and sys/ioctl.h

(cherry picked from commit ead4a032d3)

src/audio/sun/SDL_sunaudio.c

@@ -24,18 +24,12 @@
 
 /* Allow access to a raw mixing buffer */
 
+#include <sys/types.h>
 #include <fcntl.h>
 #include <errno.h>
-#ifdef __NETBSD__
 #include <sys/ioctl.h>
 #include <sys/audioio.h>
-#endif
-#ifdef __SVR4
-#include <sys/audioio.h>
-#else
 #include <sys/time.h>
-#include <sys/types.h>
-#endif
 #include <unistd.h>
 
 #include "SDL_timer.h"