use wxUnusedVar() to suppress warnings about unused variable

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26623 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/wrapcctl.h

@@ -50,7 +50,7 @@ inline void wxSetCCUnicodeFormat(HWND hwnd)
     ::SendMessage(hwnd, CCM_SETUNICODEFORMAT, wxUSE_UNICODE, 0);
 #else // !__WXWINCE__
     // here it should be already in Unicode anyhow
-    hwnd;
+    wxUnusedVar(hwnd);
 #endif // __WXWINCE__/!__WXWINCE__
 }