Author pushed the source to github, use it as new site [1]
- add extra-patch to PATCHDIR
- use new post-patch target
- unbreak the port
- bump PORTREVISION
[1] verified there is no difference between old 1.6.2 and github 8ea64c0
and writes them to a set of output files, the names of which are
constructed using template and the current date and time. The
template uses the same format specifiers as the Unix date command
(which are the same as the standard C strftime library function).
PR: 16254
Submitted by: Mark Blackman <tmb_ports@maddog.u-net.com>
