Fix issue where parallel_emerge complains that packages aren't being installed.

BUG=chromium-os:13697
TEST=Run parallel_emerge -uDNvgp --board=x86-generic chromeos --rebuild

Change-Id: I0bd72b82ae5a64e7fa46a2ddbe04455bc70264c6

R=nsanders@chromium.org

Review URL: http://codereview.chromium.org/6737018
1 file changed