Squashed 'external/SDL/' content from commit 716c767b7

git-subtree-dir: external/SDL
git-subtree-split: 716c767b7e7099fb0e2fda9db59227a7e1d1d8a4

test/main.cpp

@@ -0,0 +1,11 @@
+/*
+ * This file is supposed to be used to build tests on platforms that require
+ * the main function to be implemented in C++, which means that SDL_main's
+ * implementation needs C++ and thus can't be included in test*.c
+ *
+ * Placed in the public domain by Daniel Gibson, 2022-12-12
+ */
+
+#include <SDL3/SDL_main.h>
+
+// that's all, folks!