Disable RubyGems for --encoding specs as RubyGems fails otherwise on 2.3.7
Disable RubyGems for --encoding specs as RubyGems fails otherwise on 2.3.7

nobu/rubyspec,eregon/rubyspec,eregon/rubyspec,ruby/spec,ruby/spec,ruby/spec,ruby/rubyspec,eregon/rubyspec,ruby/rubyspec,nobu/rubyspec,nobu/rubyspec