[PATCH 1/1] Use notmuch-extract-patch if available

[Kyle Meyer]

Sean Whitton writes:

> On Sun, Dec 12, 2021 at 01:45:48PM -0500, Kyle Meyer wrote:
[...]
>> My view on it at this point is that piem and mailscripts have a
>> different focus, and I don't think users having a few options in this
>> area is a bad thing.
>
> We should probably go ahead and add links to each other in the READMEs?

Sure, will do.

And piem's documentation already points to mailscripts in a couple of
spots:

  $ git grep mailscripts
  Documentation/piem.texi:@cindex mailscripts
  Documentation/piem.texi:checking out @url{https://git.spwhitton.name/mailscripts/,mailscripts},
  Documentation/piem.texi:@cindex mailscripts
  Documentation/piem.texi:mailscripts, mentioned earlier in the manual (@pxref{Applying patches
  Documentation/piem.texi:@url{https://git.spwhitton.name/mailscripts/}