Added configure test for const_cast<>(), and enabled it
for MSVC 5 and 6, and MinGW; use const_cast<>() in wxConstCast if it is available. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19537 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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