build: Link security driver into daemon

Commit aae5cfb6 removed security driver
from libvirt_la but forgot to link it into libvirtd in case libvirt is
built without modules.

daemon/Makefile.am

@@ -164,6 +164,7 @@ endif
 if WITH_NWFILTER
     libvirtd_LDADD += ../src/libvirt_driver_nwfilter.la
 endif
+libvirtd_LDADD += ../src/libvirt_driver_security.la
 endif
 
 libvirtd_LDADD += ../src/libvirt.la