yacc: refresh for newer EAPI

BUG=None
TEST=CQ passes

Change-Id: I1eb3f30e194e69702d142aa0e48ab6050fc87ebc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2940949
Tested-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
2 files changed