bin/get-extra-pick-list: rework to use already_picked list

Currently we loop (git log --grep) to check if the fix has landed. We
can simplify and make things faster by storing the already_picked list
and grep ping through it.

Slim down the message while we're here.

Cc: "13.0 17.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
(cherry picked from commit 71e00d62ed2228a773a4f5abff98a16961e7f21c)
1 file changed