Remove redundant test for MAGIC_LOCAL_GROUPNAME membership
Remove redundant test for MAGIC_LOCAL_GROUPNAME membership

check_nonlocal_gid already stops users from getting into
MAGIC_LOCAL_GROUPNAME from nonlocal reasons.

Signed-off-by: Anders Kaseorg <087231934ba8fcf78bc142ce37d193b895ac03c4@mit.edu>

andersk/nss_nonlocal,andersk/nss_nonlocal