group SID from user token.
(current_group): Move up in file. Move fetching primary group SID to
fetch_current_pgrp_sid.
(enum_local_groups): Check if current SID is the same as current user's
primary group SID.
(enum_groups): Ditto.
(main): Call fetch_current_pgrp_sid before enumerating groups. Call
current_group only if current group hasn't been enumerated already.
* mkpasswd.c (fetch_current_user_sid): New function to fetch current
user SID from user token.
(current_user): Move fetching current user SID to
fetch_current_user_sid.
(enum_users): Check if current SID is the same as current user's SID.
(main): Call fetch_current_user_sid before enumerating users. Call
current_user only if current user hasn't been enumerated already.
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