MFH: r469932 r471167

Update devel/rubygem-rugged to 0.27.0 required for gitlab 10.7.x.

Reviewed by: tz (mentor), sunpoet (maintainer), ruby (maintainer)
Approved by: tz (mentor), sunpoet (maintainer), ruby (maintainer)
Differential Revision: https://reviews.freebsd.org/D15317

Update to 0.27.1

Changes: https://github.com/libgit2/rugged/commits/master

Approved by: ports-secteam (eadler)