Disable warnings in the standard shlobj.h header with MSVC14

There is nothing we can do about these (harmless) warnings, so just
disable them. Also make sure that the header is included via
wx/msw/wrapshl.h  everywhere.

src/common/filename.cpp

@@ -100,7 +100,7 @@
 
 #ifdef __WINDOWS__
     #include "wx/msw/private.h"
-    #include <shlobj.h>         // for CLSID_ShellLink
+    #include "wx/msw/wrapshl.h"         // for CLSID_ShellLink
     #include "wx/msw/missing.h"
     #include "wx/msw/ole/oleutils.h"
     #include "wx/msw/private/comptr.h"