vcs-snapshot.eclass: Update from ::gentoo

BUG=none
TEST=CQ passes

Change-Id: Id9b34bc446ae2a9cb213e64e79de912abf64fd3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/4290253
Auto-Submit: Matt Turner <msturner@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Matt Turner <msturner@google.com>
1 file changed