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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38945 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/menu.cpp

@@ -15,9 +15,9 @@
 #ifndef WX_PRECOMP
     #include "wx/intl.h"
     #include "wx/log.h"
+    #include "wx/app.h"
 #endif
 
-#include "wx/app.h"
 #include "wx/bitmap.h"
 
 #if wxUSE_ACCEL
@@ -1450,7 +1450,7 @@ static wxString GetGtkHotKey( const wxMenuItem& item )
 extern "C" WXDLLIMPEXP_CORE
 void gtk_pop_hide_callback( GtkWidget *WXUNUSED(widget), bool* is_waiting  )
 {
-    *is_waiting = FALSE;
+    *is_waiting = false;
 }
 
 WXDLLIMPEXP_CORE void SetInvokingWindow( wxMenu *menu, wxWindow* win )