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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39205 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/taskbarcmn.cpp

@@ -20,13 +20,12 @@
 
 #ifndef WX_PRECOMP
     #include "wx/app.h"
+    #include "wx/menu.h"
 #endif
 
 // DLL options compatibility check:
 WX_CHECK_BUILD_OPTIONS("wxAdvanced")
 
-
-#include "wx/menu.h"
 #include "wx/taskbar.h"
 
 DEFINE_EVENT_TYPE( wxEVT_TASKBAR_MOVE )