ifchange: ignore error
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52219 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ifchange: ignore error
[ruby-core:71143] [Bug #11611]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52219 b2dd03c8-39d4-4d8f-98ff-823fe69b080e