Fix warnining implicit declaration of SDL_DetectPalette (Thanks meyraud705)
diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index dfa70bc..8706cd8 100644
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -28,6 +28,7 @@
#include "SDL_render.h"
#include "SDL_sysrender.h"
#include "software/SDL_render_sw_c.h"
+#include "../video/SDL_pixels_c.h"
#if defined(__ANDROID__)
# include "../core/android/SDL_android.h"