make wxKeyEvent could get unicode key under x11, add a x11 keysym--unicode char map tab
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77846 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77846 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775