[RFC] Handle process token groups in server/file.c::sd_to_mode

[Ben Peddell]

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I have just tested this patch with the World of Warcraft launcher
(couldn't before due to a mismatch between 32-bit and 64-bit jpeg
versions, and Gentoo masking out jpeg).

After SetFileSecurityW (L"H:\\Games\\World of Warcraft", 0x4, 0x1697c8)
with the ACL "(A;OICI;GA;;;BU)", the permissions on the World of
Warcraft directory are rwxr-x---, and the Launcher successfully starts
the Downloader.
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