minijail: bring in network namespace loopback support [reland]

We've updated daisydog's init process to deal with failing in VMs,
so the issue raised in chromium:667075 should be fixed now.

Changes:
7559dfe9ed16 minijail: bring up loopback interface in new net namespaces
531ec3747e71 build: pass down CC from make env

BUG=chromium:665649
BUG=chromium:667075
TEST=`sudo ./minijail0 -r -v -p -e /sbin/ip a s` shows loopback as up

Change-Id: If8960e31b110f3a38ab2ef45810c42866ae1bfe7
Reviewed-on: https://chromium-review.googlesource.com/420383
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
1 file changed