editors/emacs-devel: Fix build on 10.4 and update

Recent changes in upstream's master branch mean a newer makeinfo than is
available in the 10.4 base system is required, so add print/texinfo to
BUILD_DEPENDS.

While here, also update to the tip of upstream's master branch and silence
portlint warnings about USE_GNOME without USES=gnome.

Reported by: pkg-fallout, antoine