Added

#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
#endif

so that the X code would compile. It looked like it was needed

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403498

src/video/x11/SDL_x11dyn.c

@@ -55,6 +55,9 @@ typedef struct
 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT
 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT NULL
 #endif
+#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
+#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
+#endif
 
 static x11dynlib x11libs[] = {
     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},