Remove expired ports:
2020-06-25 www/redmine: EOLed upstream
www/redmine-a_common_libs
www/redmine-basecamp
www/redmine-default_assign
www/redmine-graphs
www/redmine-http-auth
www/redmine-issue_templates
www/redmine-knowledgebase
www/redmine-ldap_sync
www/redmine-qa_contact
www/redmine-redcarpet_formatter
www/redmine-single_auth
www/redmine-wiki_notes