Dr. Stephen Henson 910b3a81fd Avoid Windows 8 Getversion deprecated errors.
Windows 8 SDKs complain that GetVersion() is deprecated.

We only use GetVersion like this:

	(GetVersion() < 0x80000000)

which checks if the Windows version is NT based. Use a macro check_winnt()
which uses GetVersion() on older SDK versions and true otherwise.
(cherry picked from commit a4cc3c8041104896d51ae12ef7b678c31808ce52)
2014-02-25 13:43:04 +00:00
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