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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38972 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/log.cpp

@@ -33,6 +33,7 @@
     #include "wx/arrstr.h"
     #include "wx/intl.h"
     #include "wx/string.h"
+    #include "wx/utils.h"
 #endif //WX_PRECOMP
 
 #include "wx/apptrait.h"
@@ -40,7 +41,6 @@
 #include "wx/msgout.h"
 #include "wx/textfile.h"
 #include "wx/thread.h"
-#include "wx/utils.h"
 #include "wx/wxchar.h"
 
 // other standard headers