crossdev: update to latest Gentoo version

This has new features we want (--init-target / --env).

BUG=chromium-os:31348
TEST=`cbuildbot chromiumos-sdk` worked

Change-Id: Idd27b2aa78fd965e210dece215a45e401ea355a7
Reviewed-on: https://gerrit.chromium.org/gerrit/23940
Reviewed-by: Zdenek Behan <zbehan@chromium.org>
Tested-by: Zdenek Behan <zbehan@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
2 files changed