Make internal SDL sources include SDL_internal.h instead of SDL_config.h

The new header will include SDL_config.h, but allows for other global stuff.

src/timer/SDL_timer.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_config.h"
+#include "../SDL_internal.h"
 
 #include "SDL_timer.h"
 #include "SDL_timer_c.h"

src/timer/SDL_timer_c.h

@@ -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_config.h"
+#include "../SDL_internal.h"
 
 /* Useful functions and variables from SDL_timer.c */
 #include "SDL_timer.h"

src/timer/dummy/SDL_systimer.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_config.h"
+#include "../../SDL_internal.h"
 
 #if defined(SDL_TIMER_DUMMY) || defined(SDL_TIMERS_DISABLED)
 

src/timer/haiku/SDL_systimer.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_config.h"
+#include "../../SDL_internal.h"
 
 #ifdef SDL_TIMER_HAIKU
 

src/timer/unix/SDL_systimer.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_config.h"
+#include "../../SDL_internal.h"
 
 #ifdef SDL_TIMER_UNIX
 

src/timer/windows/SDL_systimer.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_config.h"
+#include "../../SDL_internal.h"
 
 #ifdef SDL_TIMER_WINDOWS