Squashed 'external/sdl/SDL/' content from commit b8d91252c

git-subtree-dir: external/sdl/SDL
git-subtree-split: b8d91252c6488cf9c645aba447b56bb9dbd9609a

cmake/test/inc_sdl_noslash.c

@@ -0,0 +1,8 @@
+#include "SDL.h"
+#include "SDL_main.h"
+
+void inc_sdl_noslash(void) {
+    SDL_SetMainReady();
+    SDL_Init(SDL_INIT_EVERYTHING);
+    SDL_Quit();
+}