* common.mk: remove dependency from ruby.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41470 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* tool/hashbench1.rb: fix parameters.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41471 b2dd03c8-39d4-4d8f-98ff-823fe69b080e