editors/emacs-devel: Pull in latest commit to master branch.

A fix was committed for an eshell bug that resulted in piped data being
silently dropped. Pull in that fix.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=15414
https://github.com/emacs-mirror/emacs/commit/2bfe83fcd3575d03f371a7d0e6b8c5d661bc5ac7

Approved by: ashish (maintainer) swills (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D9513