Update to 1.9
    
    - New upstream release 1.9
      - Add -j option to chroot
      - Improve building on various platforms
      - Fix some typos in documentation and example config
    - Drop upstreamed strlcat patch
    - Drop gcc patch, no longer needed
    - Build with additional warnings enabled, and add patch to fix warnings where
      possible (libmilter API is missing some 'const' attributes, so it's not
      possible to get rid of all of them)