* Rework inflate out filter and give it a similar workflow as the deflate out

* Rework inflate out filter and give it a similar workflow as the deflate out
  filter. This fixes the following bugs in the inflate out filter:

  - Incorrect handling of flush buckets.
  - Excessive memory usage for large compressed content (because we now
    already sent parts down the chain and do not process the whole brigade
    first before sending something down the chain).
  - Handle the case correctly where the validation bytes at the end of
    the compressed data stream are distributed across different buckets /
    brigades.
  - Fix a memory leak due to not cleaning up the internal structures of
    libz in some error cases.

PR: 39854

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@426799 13f79535-47bb-0310-9956-ffa450edef68