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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39623 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/tbargtk.cpp

@@ -19,10 +19,10 @@
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
-#include "wx/toolbar.h"
-
 #if wxUSE_TOOLBAR_NATIVE
 
+#include "wx/toolbar.h"
+
 #ifndef WX_PRECOMP
     #include "wx/frame.h"
 #endif