FreeBSD/src 3c26408 (r320409)sys/fs/nfs nfs_commonsubs.c

Revert part of r320359, as suggested by rmacklem@.  That case is only used
for nfsuserd -manage-gids and shouldn't depend on sysctl.

MFC after:      2 weeks
Sponsored by:   DARPA, AFRL
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+1-1sys/fs/nfs/nfs_commonsubs.c
+1-11 files

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