* ChangeLog: remove duplicated entry.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39313 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* tool/mkrunnable.rb: needs rbconfig.rb.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39314 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* tool/mkconfig.rb: exclude variables to just build libruby.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39315 b2dd03c8-39d4-4d8f-98ff-823fe69b080e