git: Upgrade grep(1). 1/2

[Daniel Fojt]

commit 91b9ed38d3db6a8a8ac5b66da1d43e6e331e259a
Merge: 335b9e93c7 09d4459f3c
Author: Daniel Fojt <df at neosystem.org>
Date:   Tue Jun 2 18:58:15 2020 +0200

    Upgrade grep(1). 1/2
    
    Merge branch 'vendor/GREP' into master.

Summary of changes:

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/91b9ed38d3db6a8a8ac5b66da1d43e6e331e259a


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