Update libgit2 to 0.27.2 and removed obsolete patches from it as it is fixed upstream now.
Update devel/rubygem-rugged to 0.27.2 and took maintainer-ship for it as it is a core module required for gitlab.
Added comment suggest by mat that some ports should be updated together.

Reviewed by: mat, swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D15901