git: Upgrade diffutils. 1/2

[Daniel Fojt]

commit 358926367e7e8a44d3114a39c2faab3301a73781
Merge: fa93c955d7 6ea1f93e6f
Author: Daniel Fojt <df at neosystem.org>
Date:   Thu Jun 11 14:33:51 2020 +0200

    Upgrade diffutils. 1/2
    
    Merge branch vendor/DIFFUTILS into master.

Summary of changes:

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/358926367e7e8a44d3114a39c2faab3301a73781


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