Added precompiled header support for Visual Studio and Xcode (#6710)

Fixes https://github.com/libsdl-org/SDL/issues/6704

src/core/winrt/SDL_winrtapp_common.cpp

@@ -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_internal.h"
+#include "SDL_internal.h"
 
 #include "SDL_winrtapp_direct3d.h"
 #include "SDL_winrtapp_xaml.h"

src/core/winrt/SDL_winrtapp_common.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_internal.h"
+#include "SDL_internal.h"
 
 #ifndef SDL_winrtapp_common_h_
 #define SDL_winrtapp_common_h_

src/core/winrt/SDL_winrtapp_direct3d.cpp

@@ -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_internal.h"
+#include "SDL_internal.h"
 
 /* Standard C++11 includes */
 #include <functional>

src/core/winrt/SDL_winrtapp_xaml.cpp

@@ -18,6 +18,7 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
+#include "SDL_internal.h"
 
 /* Windows includes */
 #include <agile.h>
@@ -29,7 +30,6 @@
 
 
 /* SDL includes */
-#include "../../SDL_internal.h"
 #include "../../video/winrt/SDL_winrtevents_c.h"
 #include "../../video/winrt/SDL_winrtvideo_cpp.h"
 #include "SDL_winrtapp_common.h"

src/core/winrt/SDL_winrtapp_xaml.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_internal.h"
+#include "SDL_internal.h"
 
 #ifndef SDL_winrtapp_xaml_h_
 #define SDL_winrtapp_xaml_h_