editors/emacs: Update to version 27.1
Please refer to the 20200811 UPDATING entry when upgrading
dependent (*-emacs26-*) ports.
Port changes:
- depend on math/gmp
- match upstream by turning CAIRO, HARFBUZZ, and JSON options and on and turning MAGICK off by default
- remove OPENMP check for graphics/ImageMagick as the openmp is now included in base
- update EMACS_VER in Mk/Uses/emacs.mk
- bump USES=emacs ports or remove BROKEN for net-im/jabber.el and deskutils/howm, which now build
Submitted by: HIROSE Yuuji <yuuji@gentei.org> (canna patch)
Reviewed by: ashish
Differential Revision: https://reviews.freebsd.org/D23966