net-mgmt/cacti: Update to 1.1.12

Changes: http://www.cacti.net/release_notes.php?version=1.1.11

http://www.cacti.net/release_notes.php?version=1.1.12

PR: 220498
Submitted by: Daniel Austin <freebsd-ports@dan.me.uk> (maintainer)
Approved by: garga (mentor, implicit)