sysutils/rubygem-bundler1: Repocopied from sysutils/rubygem-bundler

Some rubygem ports still depends on Bundler 1 series. Before updating
sysutils/rubygem-bundler to 2.0.x, the older version should be kept in
the ports tree.

Submitted by: meta (myself)
Reviewed by: mfechner
Approved by: mfechner
Differential Revision: https://reviews.freebsd.org/D19818