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/common/zstream.cpp

@@ -22,10 +22,10 @@
 
 #ifndef WX_PRECOMP
     #include "wx/intl.h"
+    #include "wx/log.h"
 #endif
 
 #include "wx/utils.h"
-#include "wx/log.h"
 
 // normally, the compiler options should contain -I../zlib, but it is
 // apparently not the case for all MSW makefiles and so, unless we use