Do not interrupt on SIGCONT

SIGCONT signals should not interrupt any system calls (locking or wait pid for
example).

BUG=chromium:417800
TEST=build_packages --board=amd64-generic works.
TEST=trybot run on chromiumos-sdk.

Change-Id: Ibb74a60a821e06255d906f85208f85f7f58e08c6
Reviewed-on: https://chromium-review.googlesource.com/220077
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
1 file changed