- fix POOL_DEBUG ... restored the ap_pool_joins that dreid removed.

- removed the apr_abort foo since every caller was passing it NULL anyway;
  and this is debugging code, so i don't have any qualms about using
  stderr or abort().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85888 13f79535-47bb-0310-9956-ffa450edef68