Make sure that we use consistent configuration options on platforms l…

…ike Windows so that command line builds and IDE builds have ABI compatibility.

Make sure we don't clobber SDL_revision.h when building from Mercurial

src/atomic/SDL_spinlock.c

@@ -18,7 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#include "SDL_stdinc.h"
+#include "SDL_config.h"
 
 #include "SDL_atomic.h"
 #include "SDL_mutex.h"