bug#60147: 30.0.50; vc-prepare-patch: Add numbered patch file names

[Sean Whitton]

X-debbugs-cc: philipk@posteo.net

Hello,

If you receive a message generated by vc-prepare-patch and then you save all
the attachments to a directory, you lose any indication of the order in which
the patches are meant to be applied.

git-format-patch(1) numbers the patch files it saves.  Thus, with most mail
clients, when the recipient saves all the attachments to a local directory,
they'll be ordered.  I think it would be useful for vc-prepare-patch to do
something similar.  Please find a patch attached.

--
Sean Whitton

0001-vc-prepare-patch-Number-the-attached-patches.patch
Description: Text Data