CHROMIUM: emerge: trim useless auto-clean message

This message is always shown on every single build because we always
have AUTOCLEAN enabled and we never turn it off (nor would we ever
want to turn it off).  This leads to useless log spam that devs just
ignore.  Delete it.

BUG=chromium:996480
TEST=`emerge libaio` doesn't spam this at the end

Change-Id: Ia1003fd100f63b4288ee826bbedbeea41b46f8a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/1961315
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed