compilation fixes for PCH-less build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45594 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/apptrait.h

@@ -15,6 +15,7 @@
 #include "wx/string.h"
 #include "wx/platinfo.h"
 
+class WXDLLIMPEXP_BASE wxArrayString;
 class WXDLLIMPEXP_BASE wxObject;
 class WXDLLEXPORT wxAppTraits;
 #if wxUSE_FONTMAP

src/common/dlgcmn.cpp

@@ -27,6 +27,7 @@
 #include "wx/dialog.h"
 
 #ifndef WX_PRECOMP
+    #include "wx/app.h"
     #include "wx/button.h"
     #include "wx/dcclient.h"
     #include "wx/intl.h"