give an error and stop if OpenGL libs not found but --with-opengl was specified
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12263 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12263 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775