Ruby

test/unit.rb: old GNU make

• test/lib/test/unit.rb (Test::Unit::Parallel#non_options):
  support old GNU make, which uses --jobserver-fds option instead
  of --jobserver-auth.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57563 b2dd03c8-39d4-4d8f-98ff-823fe69b080e