editors/emacs: WIP to prepare for upcoming 26.3 release

[jrm]

Summary

PR:
Submitted by:
Reported by:

Test Plan

poudriere testport for 11/12 i386/amd64 passes for the full and nox flavors. The canna flavor fails, because the current canna patch [1] fails to apply cleanly. I will contact those responsible for the canna patch to see if they are interested in updating it.

[1] http://www.gentei.org/~yuuji/software/emacs26canna/emacs26.1-canna-20180529.diff.gz

[jrm]

editors/emacs: [WIP] re-add canna information to distinfo