ports/160291: devel/rubygem-rake 0.9.2 update breaks readmine

[rubyneko neko]

It is not a bug.

Unfortunately, redmine wont a very old libraries, and that problem not
FreeBSD only.

http://www.redmine.org/projects/redmine/wiki/RedmineInstall
>> Rake 0.8.7 is required (rake 0.9.x is not supported by Rails yet)

Use gem for hard install different version. Downgrade this port only for
redmine bad idea.