merge this fix from 2.1-dev:

    * Fix mod_deflate not to search somewhere in the memory for the "gzip"
      token and to skip token parameters. PR 21523.
      Don't compress if there was *any* non-identity endoding applied before.

PR:               21523
Submitted by:	  Joe Orton, Andr�� Malo
Reviewed by:	  striker, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@101264 13f79535-47bb-0310-9956-ffa450edef68