* server/core_filters.c (send_brigade_nonblocking): Use a non-blocking

  bucket read, allowing any pending data to be flushed before trying a
  (potentially slow) blocking read.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1234899 13f79535-47bb-0310-9956-ffa450edef68