Workaround broken -C option in tar 1.2.6.

This is needed for migrating to Precise, since the version of
tar in Ubuntu Precise has a broken -C option.

BUG=chromium:181685
TEST=Unit tests. Remote trybot run.

Previous-Change-Id: I1356a1fe2e2e3b562d82360dc37e9c2278b567ee
Change-Id: I44e60a50d2998fa2808673f30f80bfb5ce9af6fa
Previous-Reviewed-on: https://gerrit.chromium.org/gerrit/45295
(cherry picked from commit 48ad59329085b218371c8117a3181bc8ecce5fe9)
Reviewed-on: https://gerrit.chromium.org/gerrit/45471
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: David James <davidjames@chromium.org>
1 file changed