Remove SDL_config.h from the public headers

The SDL headers are no longer dependent on the build configuration.

Fixes https://github.com/libsdl-org/SDL/issues/6643 and https://github.com/libsdl-org/SDL/issues/6641

src/sensor/android/SDL_androidsensor.c

@@ -20,8 +20,6 @@
 */
 #include "../../SDL_internal.h"
 
-#include "SDL_config.h"
-
 #ifdef SDL_SENSOR_ANDROID
 
 /* This is the system specific header for the SDL sensor API */

src/sensor/android/SDL_androidsensor.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"
 
 /* The private structure used to keep track of a sensor */
 struct sensor_hwdata