* Add parameter crc to flush_libz_buffer in order to call the libz's crc32

  function on the output buffer if needed. This is actually needed by the
  later rework of the inflate out filter.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@426790 13f79535-47bb-0310-9956-ffa450edef68