dev-libs/pkcs11-helper: Upgrade package to v1.21

This is required by the latest openvpn ebuilds.

BUG=chromium:716913
TEST=manually emerge + deploy to samus; connect to a cert based VPN

Change-Id: I437bfd4c5859efd60b334c2d690a356380f64042
Reviewed-on: https://chromium-review.googlesource.com/491070
Commit-Ready: Kevin Cernekee <cernekee@chromium.org>
Tested-by: Kevin Cernekee <cernekee@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
5 files changed