OpenBSD: Install no-NFS version of libafs

OpenBSD: Install no-NFS version of libafs

The build process for OpenBSD builds the no-NFS version of
the kernel module but, at install time, the NFS version is
subseuquently built and installed while the no-NFS version
is ignored. The NFS version does not load and is not needed
in OpenBSD so this patch makes sure that the no-NFS version
is installed and used.

Change-Id: I1d07334121911c22aea1f6d157f34e1b40e5b780
Reviewed-on: http://gerrit.openafs.org/3684
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>