Rename the many flavors of filter_ctx (pRec, fctx etc) to filter_ctx,
  wbio to bio_out, BIO new and free to create and destroy (to match OpenSSL),
  refactor the bio write code to stash errors in outctx->rc,
  fix the blocking read at EOF if we have some data to return,
  and preempt the nonblock read on GETLINE if we have the newline already.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97393 13f79535-47bb-0310-9956-ffa450edef68