[macOS] Fix compile on macOS

Error was:

  [ 93%] Building CXX object build/platform/osx/SDL/CMakeFiles/platform_osx_SDL.dir/OSXTextInputResponder.mm.o
  platform/darwin/osx/SDL/OSXTextInputResponder.mm:26:25: error: allocation of incomplete type 'CAction'

  CAction *action = new CAction(ACTION_INPUT_TEXT);
                        ^~~~~~~

xbmc/platform/darwin/osx/SDL/OSXTextInputResponder.mm

@@ -11,6 +11,8 @@
 #include "GUIUserMessages.h"
 #include "ServiceBroker.h"
 #include "guilib/GUIWindowManager.h"
+#include "input/actions/Action.h"
+#include "input/actions/ActionIDs.h"
 #include "input/keyboard/Key.h"
 #include "messaging/ApplicationMessenger.h"
 #include "utils/log.h"