lldpd: Update to version 0.7.19

The new release has following important changes, worth noticing:

- fix-libevent-configure patch has been applied upstream
- fix for CVE-2015-8012

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>