Compilation fixes for PCH-less build after ownerdraw-refactor branch merge.

Forward declare more classes, in particular use tagRECT which can be forward
declared, instead of RECT typedef in public headers.

Also include more header in #ifndef WX_PRECOMP case.

See #11595.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63272 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/menuitem.cpp

@@ -30,6 +30,8 @@
 #include "wx/stockitem.h"
 
 #ifndef WX_PRECOMP
+    #include "wx/app.h"
+    #include "wx/dcmemory.h"
     #include "wx/font.h"
     #include "wx/bitmap.h"
     #include "wx/settings.h"