Fixed compiling for Raspberry Pi
diff --git a/src/video/SDL_egl.c b/src/video/SDL_egl.c
index f9cdcda..0ca0053 100644
--- a/src/video/SDL_egl.c
+++ b/src/video/SDL_egl.c
@@ -30,6 +30,9 @@
#include "../core/android/SDL_android.h"
#include "../video/android/SDL_androidvideo.h"
#endif
+#if SDL_VIDEO_DRIVER_RPI
+#include <unistd.h>
+#endif
#include "SDL_sysvideo.h"
#include "SDL_egl_c.h"