hash.c: use rb_func_proc_new
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52524 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
hash.c: use rb_func_proc_new
weight proc. [Feature #11653]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52524 b2dd03c8-39d4-4d8f-98ff-823fe69b080e