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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38920 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/taskbar.cpp

@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////
-// File:        taskbar.cpp
+// File:        src/gtk/taskbar.cpp
 // Purpose:     wxTaskBarIcon (src/unix/taskbarx11.cpp) helper for GTK2
 // Author:      Vaclav Slavik
 // Modified by:
@@ -13,7 +13,11 @@
 #include "wx/wxprec.h"
 
 #include "wx/gtk/taskbarpriv.h"
-#include "wx/log.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/log.h"
+#endif
+
 #include "wx/frame.h"
 #include "wx/menu.h"