Include wx/intl.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38909 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/classic/app.cpp

@@ -15,16 +15,20 @@
     #pragma hdrstop
 #endif
 
+#include "wx/app.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/intl.h"
+#endif
+
 #include "wx/window.h"
 #include "wx/frame.h"
 #include "wx/button.h"
-#include "wx/app.h"
 #include "wx/utils.h"
 #include "wx/gdicmn.h"
 #include "wx/pen.h"
 #include "wx/brush.h"
 #include "wx/cursor.h"
-#include "wx/intl.h"
 #include "wx/icon.h"
 #include "wx/palette.h"
 #include "wx/dc.h"