Add back PORTEPOCH which got lost in the GNOME 3 import in rev 372768.

Submitted by:	John Hein <john.hein@microsemi.com>


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374592 35697150-7ecd-e111-bb59-0022644237b5
Update to 0.18.
Add more mirrors (primary is currently down) as well as MASTER_SITE_LOCAL
This claims to have integrated patches from the port, but only one patch
gets deleted.


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@374593 35697150-7ecd-e111-bb59-0022644237b5