don't fall back to GTK 1.x if --with-gtk2 was specified; don't try to build in Unicode when using GTK 1.x
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17727 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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