strongswan: add configure patch fix for systemd

Fixes strongswan configure script for systemd >= 209,
where it merged libsystemd-journal and libsystemd-daemon
into libsystemd.

Signed-off-by: Chris Patterson <pattersonc@ainfosec.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>