add -pthread like options to the linker flags as well; also (finally!) fixed -g and -On handling in CFLAGS
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15163 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15163 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775