disable licensing hook warning

This warning is not actionable by anyone other than the build team,
and we have bugs to track it.  All other users of the system are
just confused by the output.

BUG=chromium:197970 chromium:271832 chromium:207004 chromium:356539
TEST=`emerge-x32-generic crosutils` doesn't work

Change-Id: I438f754292f777db3c14f422fe6527a117664689
Reviewed-on: https://chromium-review.googlesource.com/204000
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed