Log Message:
(pkgsrc)
  - Add comment for patch-util_avutil.h  (from commit log)
  - Remove patches, found the same change incorporated:
      patches/patch-libasync_itree.h
      patches/patch-libasync_qhash.h
      patches/patch-libasync_vec.h
(upstream)
  - update 0.8.2 to 0.8.4

* Changes in release 0.8.4
  - Switch to new resolver library interface, as previous way of
    reloading resolv.conf is no longer compatible with glibc.
  - Set IP_FREEBIND option if available.
  - Added systemd avenger.service file.
* Changes in release 0.8.3
  - Updated to work with gcc 4.7.