ext/dl/callback/depend: fix for parallel build.
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/depend: fix for parallel build.
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