Detect if g++ requires -fvtable-thunks for COM interfaces.
Newer g++ does not require nor support it, so it must not be used. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16792 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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