dev-util/shfmt: make it work with new go-module.eclass

BUG=None
TEST=`sudo emerge shfmt` in cros_sdk mode updated /usr/bin/shmft .

Change-Id: Icc6944032da002fa95701bff85cb1b60e57ca8ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2266239
Tested-by: Edward Jee <edjee@google.com>
Commit-Queue: Edward Jee <edjee@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Edward Jee <edjee@google.com>
3 files changed