editors/emacs-devel: Update to recent commit from the master branch

[jrm]

Summary

Recent commits to the master branch:
https://github.com/emacs-mirror/emacs/commits/master75

Test Plan

portlint -C: INSTALL_ICON warnings that are taken care of with the X11 option
testport: OK (poudriere: 10.3-RELEASE-p10, i386, default options)
testport: OK (poudriere: 10.3-RELEASE-p10, amd64, default options)
testport: OK (poudriere: 11.0-RELEASE-p1, i386, default options)
testport: OK (poudriere: 11.0-RELEASE-p1, amd64, default options)

[ashish]

Looks good to me, and seems to build fine. Please proceed with commit.

Thanks!

[jrm]

When running poudriere testport on a more recent commit, there were some
failures
(http://pkg.awarnach.mathstat.dal.ca/data/11amd64-default/2017-04-15_10h39m05s/logs/errors/emacs-devel-26.0.50.20170415,2.log)
that were fixed by adding MAKE_JOBS_UNSAFE=yes.

Ashish, are you OK with this change to include MAKE_JOBS_UNSAFE=yes and a
slightly newer commit that includes a few important fixes? This revision passes
all the same poudriere tests and I'm running it now and there have been no
immediate surprises.

[ashish]

This one also looks good. Please proceed.

Thanks!