bug#57400: 29.0.50; Support sending patches from VC directly

[Robert Pluim]

>>>>> On Wed, 05 Oct 2022 21:08:36 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Philip Kaludercic <philipk@posteo.net> writes:
    >> There is no inherent reason why it has to be bound.  I just wanted to
    >> bring it up.

    Lars> Sure.  But I think it would be nice if it had a binding -- I think 
this
    Lars> is very useful functionality.

If we once again steal from Magit, it has patch commands on 'W',
presumably for 'W'rite (and 'git am' is on 'w')

Robert
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