net-im/rubygem-earthquake: Remove port

This port has been broken for years and no longer maintained by upstream.

Also, remove security/rubygem-jugyo_twtter_oauth. It is a fork of
twitter_oauth[1] and required only by net-im/rubygem-earthquake.

[1] https://rubygems.org/gems/twitter_oauth

Approved by: hrs (mentor)
Differential Revision: https://reviews.freebsd.org/D15441