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
Previous-Change-Id: Id3979ff8a727f342eae7c4f07fe6e3bf173b0ea9
Change-Id: I9910232c09202534832dc4feb4be8ae52501e8fa
Previous-Reviewed-on: https://gerrit.chromium.org/gerrit/45295
(cherry picked from commit 135aa4e05c8f52444fa134071cdd299df2852f15)
Reviewed-on: https://gerrit.chromium.org/gerrit/45463
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: David James <davidjames@chromium.org>
1 file changed