devel/menhir: update to 20170607 and takeover maintainership

[ultima]

Summary

• Updated to 20170607
• New maintainer Jov <[e-mail]>
• Added license, GPLv2
• Moved USES, USES should start section followed by USE_x(13.1.6)[1]
• Moved plist items from Makefile to pkg-plist

Changelog: https://gitlab.inria.fr/fpottier/menhir/blob/master/CHANGES.md

[1] https://www.freebsd.org/doc/en/books/porters-handbook/porting-samplem.html#porting-samplem-order

PR\: 220535
Sumitted by\: Jov <[e-mail]> (maintainer)
Reviewed by\: lifanov (mentor), matthew (mentor)
Approved by\: lifanov (mentor), matthew (mentor)
Differential Revision\: https://reviews.freebsd.org/DXXXXX

Test Plan

portlint:
WARN: Makefile: [35]: use ${VARIABLE}, instead of $(VARIABLE).
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
0 fatal errors and 2 warnings found.

poudriere:
103i386
103amd64
110i386
110amd64
12i386
12amd64

[lifanov]

Looks good!