(path_conv::is_lnk_symlink): New function. True if path represents .lnk style
symlink.
* path.cc (check_shortcut): Set PATH_LNK in pflags when appropriate.
(symlink_info::check): Ditto. Remove PATH_LNK from pflags initially.
* syscalls.cc (unlink): Always remove readonly attribute from a symlink
regardless of type.
(link): (from Corinna Vinschen) Allow links to symlinks. Reset attributes on a
symlink after successful link creation.
(chmod): Use is_lnk_symlink where appropriate.
(rename): Ditto.
* tty.cc (create_tty_master): Call GetComputerName instead of
cygwin_gethostname. Set ut_id.
* syscalls.cc (login): Call endutent.
(setutent): Do not seek after a fresh open.
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