eclass: import epunt-cxx.eclass from upstream Gentoo

This CL imports epunt-cxx.eclass (at commit
71791dbb2b3c55e8b99b769a5f86f377df594a46) from upstream Gentoo.

BUG=chromium:680616
TEST=Remote trybot runs.

Change-Id: I7c6bdd64e6633a0e36626c8c34e688a891aed024
Reviewed-on: https://chromium-review.googlesource.com/493551
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed