W32: tighten access rights requested to read symlink
W32: tighten access rights requested to read symlink

According to
http://blog.kalmbach-software.de/2008/02/28/howto-correctly-read-reparse-data-in-vista/
we only need FILE_READ_EA, and should also use wider share flags.

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib