devel/magit: Add upstream patch to fix build with latest editors/emacs-devel

With latest editors/emacs-devel build fails as below.

gmake[1]: Entering directory '/wrkdirs/usr/ports/devel/magit/work-devel_full/magit-4.4.2/lisp'
Compiling magit-section.el
Compiling magit-base.el
Compiling magit-git.el
Compiling magit-mode.el
Compiling magit-process.el
Compiling git-commit.el
Compiling magit-margin.el
Compiling magit-transient.el
Compiling magit-autorevert.el
Compiling magit-core.el

In toplevel form:
magit-core.el:38:11: Error: Symbol's value as variable is void: magit-auto-revert-mode
gmake[1]: * [Makefile:71: magit-core.elc] Error 1
gmake[1]: Leaving directory '/wrkdirs/usr/ports/devel/magit/work-devel_full/magit-4.4.2/lisp'
gmake: * [Makefile:74: lisp] Error 2

• Error code 1

Stop.
make: stopped in /usr/ports/devel/magit

So add upstream patch to fix it.