git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@29911 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
modifications for the difference of mkmf.rb.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@29911 b2dd03c8-39d4-4d8f-98ff-823fe69b080e