* debian/watch: fix up to catch .xz files now.
* debian/patches/git_segfault_nmagentmanager_3227cf0.patch,
  debian/patches/git_agent_removing_requests_b2312d4.patch,
  debian/patches/git_disp_logging_crash_aca907f.patch,
  debian/patches/git_fix_shadowed_var_abe208e.patch,
  debian/patches/git_default_route_active_device_9820258.patch: removed;
  included in the upstream tarball.
* Removed other old patches no longer used from debian/patches.