fix some major badness: error buckets *cannot* use simple_copy because

fix some major badness: error buckets *cannot* use simple_copy because
they're not simple buckets.  they have a private data structure which
gets freed.  if you're going to copy them and share whatever ->data points
to (which is what simple_copy does), you have to refcount the structure,
which is the whole point of apr_bucket_refcount and apr_bucket_shared_copy.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@95421 13f79535-47bb-0310-9956-ffa450edef68