Makefile.sub: fix dependency of RUBYDEF
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57186 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Makefile.sub: fix dependency of RUBYDEF
requires rbconfig.rb.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57186 b2dd03c8-39d4-4d8f-98ff-823fe69b080e