devel/rubygem-gettext: update to 3.1.6

[mmoll]

Summary

I tried to reach knu@ via two different e-mail addresses and GitHub over the last weeks, but got no respone, so I'd commit this on maintainer timeout once I get clearance here. Proposed commit message:

devel/rubygem-gettext: update to 3.1.6

Approved by:	swills (mentor), mat (mentor), knu (maintainer, timeout)

Test Plan

http://space.kvedulv.de/FreeBSD/locale_gettext/ (together with the proposed rubygem-locale update)
portlint:

mmoll@marduk:/svn/ports/devel/rubygem-gettext$ portlint -ACNc
looks fine.

[swills]

Guessing a lot of things depend on this, can you build test those?

[swills]

Also, title is wrong for this review.

[mmoll]

I built all ports that depend directly on locale or gettext in the linked poudriere run, there are not much of those.

[swills]

Approved

[mmoll]

committed in rP389754