This does not solve the actual problem of this function not returning the
correct value for Windows 8+ any more, but at least allows to compile the
library without warnings with MSVC 12 and later.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76400 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775