2. fixed memory leak with wxLogStderr in wxBase
3. updated tmake files/makefiles for wxBase with wxSocket under MSW
4. fixed wxSashWindow cursor bug by allowing SetCursor(wxNullCursor)
5. fixed warning in gsock*.c
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6751 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775