gentoolkit: update to latest upstream

This includes a fix related to PORTAGE_CONFIGROOT which is needed to
make equery work when used with target boards.

BUG=chromium-os:37685
TEST=`cros_portage_upgrade --unstable-ok` works again

Change-Id: I4e27731b04b67bea98418914b4a9a95fb0d09fb0
Reviewed-on: https://gerrit.chromium.org/gerrit/45213
Reviewed-by: Matt Tennant <mtennant@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
4 files changed