git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22963 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ext/dl/callback/extconf.rb: callback.h is no longer created. * ext/dl/callback/mkcallback.rb: creates main source first. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22863 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ext/dl/callback: split from dl. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22722 b2dd03c8-39d4-4d8f-98ff-823fe69b080e