configure: Fix when no libsystemd compat lib are available

configure: Fix when no libsystemd compat lib are available

From systemd change log, since version 209, libsystemd.so contain
everything, including libsystemd-daemon.so. Distro may, or may not provide
the compatibility libraries which libsystemd-daemon is part of.

So, if libsystemd-daemon is not available, check for the presence of
a recent enough libsystemd.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
[ wei: run autogen.sh ]
Acked-by: Wei Liu <wei.liu2@citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>