pthreadpool: Only link pthreadpool against librt if we have to
This calls clock_gettime() which is available in glibc on Linux. If the
wscript in libreplace detected that librt is needed for clock_gettime()
we have to link against it.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14140
Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Isaac Boukris <iboukris@gmail.com>
Pair-Programmed-With: Isaac Boukris <iboukris@gmail.com>
Reviewed-by: Matthias Dieter Wallnöfer <mdw@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>