Fixed compile warnings with Visual C++

src/SDL_compat.c

@@ -704,7 +704,6 @@ SDL_UpdateRects(SDL_Surface * screen, int numrects, SDL_Rect * rects)
             SDL_DirtyTexture(SDL_VideoTexture, numrects, rects);
         } else {
             /* The surface memory needs to be copied to texture */
-            void *pixels;
             int pitch = screen->pitch;
             int psize = screen->format->BytesPerPixel;
             for (i = 0; i < numrects; ++i) {

src/video/dummy/SDL_nullrender.c

@@ -24,6 +24,7 @@
 #include "SDL_video.h"
 #include "../SDL_sysvideo.h"
 #include "../SDL_yuv_sw_c.h"
+#include "../SDL_renderer_sw.h"
 #include "../SDL_rendercopy.h"
 
 

test/testgl2.c

@@ -300,6 +300,7 @@ main(int argc, char *argv[])
                ((double) frames * 1000) / (now - then));
     }
     quit(0);
+	return 0;
 }
 
 #else /* HAVE_OPENGL */