Add SDL_main.h includes to tests

.. including cmake/test/*.c, whatever that does

(this is needed now because SDL.h doesn't include SDL_main.h anymore)

test/testhaptic.c

@@ -17,6 +17,7 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 #include <stdlib.h>
 
 #include <SDL3/SDL.h>
+#include <SDL3/SDL_main.h>
 
 static SDL_Haptic *haptic;