Emacs ports: Improve consistency between the two Emacs ports and...

• [1] Do not link liblockfile when MAILUTILS option is off. Users who want mail functionality should turn on the MAILUTILS option. See PR 227799.

• [2] Create a link under exec_directory pointing to ${PREFIX}/bin/movemail. See upstream bug https://bugs.gnu.org/31737 and PR 228833.

• Based on user feedback, change the package name for the nox flavor of editors/emacs-devel from emacs-devel_nox to emacs-devel-nox. The original motivation for naming the package emacs-devel_nox was so that PKGNAMESUFFIX would match the flavor names for USES=emacs ports and flavor names cannot contain '-'.

• Remove patches that are no longer necessary. The patch emacs-devel/files/patch-configure.ac is no longer necessary because 10.3, which included an old version of texinfo in base, is EOL. The lldb-gud patch is no longer necessary because the LLDB option has been removed.

• Update editors/emacs-devel to a newer commit on the upstream master branch.

• Customize COMMENT for nox flavor of editors/emacs-devel.

PR: 227799 [1], 228833 [2]
Submitted by: yasu@utahime.org [1], bengta@sics.se [2]
Approved by: ashish
Differential Revision: https://reviews.freebsd.org/D15728