git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29796 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r29242 from trunk into ruby_1_9_2.¶
bug in system header of darwin 9. [ruby-core:32341]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29796 b2dd03c8-39d4-4d8f-98ff-823fe69b080e