shell32: Check if token references the current user

[Dan Kegel]

Ge is looking for feedback on this patch,
could somebody familiar with the innards of
SHGetFolderPath() comment?

http://bugs.winehq.org/show_bug.cgi?id=10905#c6 /
http://www.winehq.org/pipermail/wine-patches/2007-December/048437.html

Thanks,
Dan