devel/rbenv: Update to 1.1.1

Changes: https://github.com/rbenv/rbenv/releases/tag/v1.1.1

PR: 220243
Submitted by: Jose Luis Duran <jlduran@gmail.com>
Approved by: garga (mentor), meta+ports@vmeta.jp (maintainer)
Differential Revision: https://reviews.freebsd.org/D11360