* In preparation of the changes of the inflate out filter:

  - rename flush_zlib_buffer to flush_libz_buffer (this name seems
    better)
  - add a parameter to tell flush_libz_buffer whether it should
    deflate or inflate as this function should be also used for the
    inflate out filter.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@423940 13f79535-47bb-0310-9956-ffa450edef68