net-misc/cgminer: sync with maintree and gentoo tree

There were numerous older ebuilds that had been abandoned.  These
are cleaned out as they should not be used.  We now have a baseline
of maintained ebuilds moving foward.

Also, 3.3.1 as merged from git://ssl.bakka.su/baka-bakka used git
pull from github, but we switch to the archive at
http://ck.kolivas.org/apps/cgminer/.