common.sh: drop unused enable_strict_sudo func

The last user of this was dropped years ago in CL:36619.  Clean it up.

BUG=None
TEST=CQ passes

Change-Id: If39e24d0dc372a086dd0df1d2274540b60e042d1
Reviewed-on: https://chromium-review.googlesource.com/1764952
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
1 file changed