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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39021 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/palette.cpp

@@ -42,10 +42,9 @@ not the functionality that wxPalette::Create() aims to provide.
 #ifndef WX_PRECOMP
     #include "wx/app.h"
     #include "wx/utils.h"
+    #include "wx/window.h"
 #endif
 
-#include "wx/window.h"
-
 #ifdef __VMS__
 #pragma message disable nosimpint
 #endif