###### Motivation for this change
Update to latest upstream version
###### Things done
* [ ] Tested using sandboxing ([nix.useSandbox](http://nixos.org/nixos/manual/options.html#opt-nix.useSandbox) on NixOS, or option `sandbox` in [`nix.conf`](http://nixos.org/nix/manual/#sec-conf-file) on non-NixOS linux)
* Built on platform(s)
* [x] NixOS
* [ ] macOS
* [ ] other Linux distributions
* [ ] Tested via one or more NixOS test(s) if existing and applicable for the change (look inside [nixos/tests](https://github.com/NixOS/nixpkgs/blob/master/nixos/tests))
* [ ] Tested compilation of all pkgs that depend on this change using `nix-shell -p nix-review --run "nix-review wip"`
* [x] Tested execution of all binary files (usually in `./result/bin/`)
* [ ] Determined the impact on package closure size (by running `nix path-info -S` before and after)
* [ ] Ensured that relevant documentation is up to date
* [x] Fits [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md).
###### Notify maintainers
cc @blitz @Ma27 @tfc @worldofpeace
This moves libappindicator to use a different upstream source. Rather
than use the 8 year old (!) version displayed on its homepage
(https://launchpad.net/libappindicator), this switches us to the
maintained lp:libappindicator branch, browseable over here:
https://code.launchpad.net/~indicator-applet-developers/libappindicator/trunk.
This includes numerous fixes, remains updated, and matches what ubuntu
uses.
Due to a personal preference for git over bzr, I have the package using
ubuntu's git mirror of the package for the source rather than the bzr
repo where I _think_ development actually takes place.
This also removes the no-python patch, because per revision 292
(https://bazaar.launchpad.net/~indicator-applet-developers/libappindicator/trunk/revision/292),
that has been dropped from upstream already, so the patch is no longer
needed.
The primary motivation behind this change is to fix a crash with
libappindicator (reported
https://bugs.launchpad.net/ubuntu/+source/libappindicator/+bug/1867996
and in various other places).
The relevant patch for that should be included in this version.
According to RFC4291[1], 2001:db8:: is the anycast address for the
prefix and will be answered by all routers responsible for this prefix.
This means that before the iputils bump, the ping from client to isp was
answered by the router and not by the ISP machine. Switching away from
the anycast address fixes this issue.
Credits for finding this go to @primeos.
[1]: https://tools.ietf.org/html/rfc4291#section-2.6.1Fixes#96188
