`git grep` is too picky about option parsing

From: Jan Engelhardt <jengelh@inai.de>
Date: Dec 6, 2020, 22:12 UTC
Message-ID: <704q5rs6-63q1-sp78-9845-227oq8q42o8q@vanv.qr>

Version: 2.29.2

-e, -i, -l and -n are all valid options for grep as well as git grep, yet git-grep refuses to operate if they appear in a specific order.

Observed:

$ git grep -e abc -lin error: did you mean `--lin` (with two dashes)?

Expected:

$ git grep -e abc -lin somefile

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