use gtk2 as toolkit name instead of gtk if built against GTK+ 2.0
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17898 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17898 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775