rbinstall.rb: skip symlinks
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36897 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
rbinstall.rb: skip symlinks
by `make runnable'.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36897 b2dd03c8-39d4-4d8f-98ff-823fe69b080e