* security.cc (get_group_sidlist): Add pw argument and use pw->pw_name in call

* security.cc (get_group_sidlist): Add pw argument and use pw->pw_name in call
to get_supplementary_group_sidlist.
(create_token): Add pw argument and use it in call to get_group_sidlist.
* security.h: Add pw argument in declaration of create_token.
* syscalls.cc (seteuid32): Add pw argument in call to create_token.