Fix warning for Android NDK compiler: "function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]"

https://stackoverflow.com/questions/42125/warning-error-function-declaration-isnt-a-prototype
In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing.

(cherry picked from commit ccade50587)

src/test/SDL_test_imageFace.c

@@ -223,7 +223,7 @@ static const SDLTest_SurfaceImage_t SDLTest_imageFace = {
 /**
  * \brief Returns the Face test image as SDL_Surface.
  */
-SDL_Surface *SDLTest_ImageFace()
+SDL_Surface *SDLTest_ImageFace(void)
 {
     SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormatFrom(
         (void *)SDLTest_imageFace.pixel_data,