Squashed 'external/SDL/' content from commit 4d17b99d0a

git-subtree-dir: external/SDL
git-subtree-split: 4d17b99d0a1c33c5257063b098f883c669ade40b

cmake/test/inc_sdl_slash.c

@@ -0,0 +1,8 @@
+#include "SDL3/SDL.h"
+#include "SDL3/SDL_main.h"
+
+void inc_sdl_slash(void) {
+    SDL_SetMainReady();
+    SDL_Init(0);
+    SDL_Quit();
+}