For now only `turn-on-flyspell' is obsolete in Emacs 31.1.
Get it over with and stop using `turn-on-auto-fill' as well.

Suggested-by: Stefan Kangas <stefankangas@gmail.com>

The `git-commit--trailer-regexp' regex is written so that either groups
1 and 2 will match or groups 3 and 4 will match, but it is impossible
for all 4 groups to match.

This patch updates the font-lock regex checker to be lax about whether
or not the group matched.  Without this patch we have errors like:

  Error during redisplay: (jit-lock-function 77) signaled
    (error "No match 3 in highlight (3 'git-commit-trailer-token)")

Signed-off-by: Curt Brune <curt@brune.net>
Make-it-so: Jonas Bernoulli <jonas@bernoul.li>

The sequel.  Part 1 was [1: 7f47299581].

1: 2025-01-05 7f47299581abb6f77870cb5abdae159fcd35b3d5
   Let the byte-compiler check more function references

There is a circular dependency between `magit-git' and `magit-process',
which we break by declaring some functions from the latter in the
former.  This usually works out fine because loading `magit' loads both
libraries.

However, when someone only loads `git-commit', then this broke and to
fix it we have to explicitly require `magit-process' in that library
as well.

Also explicitly require `magit-git', even though that isn't strictly
necessary because `magit-mode' requires `magit-git'.  Finally also
update the dependency declaration in "lisp/Makefile".

Closes #5280.