* array.c (ary_make_shared): make shared array shady.
  Making non-shady shared array causes SEGV (see rubyci).
  It seems a bug around shared array.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42079 b2dd03c8-39d4-4d8f-98ff-823fe69b080e