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Don't emit "diff: diff <options> arguments" when diffing files if

Description

Don't emit "diff: diff <options> arguments" when diffing files if
-q is specified.

This improves compatibility with GNU diff.

Found by accident with diff -Nrq /usr/tests /usr/tests.new | grep Kyuafile.

MFC after: 2 months
Relnotes: yes

Details

Provenance
ngieAuthored on
Parents
rS321075: Set the current vnet pointer in the socket buffer AIO handler.
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