build: Link correctly to setproctitle if not in libbsd
libbsd becomes essentially globally linked due to providing other key features so this missing dependency was missed.
Testing by a user on FreeBSD (hi @b-a-t) and on altlinux needed.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=9863 Signed-off-by: Andrew Bartlett abartlet@samba.org