asterisk: fix service installation and upgrade to 13.6.0

Improve Unicode coverage

gnuchess: 6.2.1 -> 6.2.2

See http://lists.gnu.org/archive/html/info-gnu/2015-10/msg00005.html

apacheHttpd: 2.4.16 -> 2.4.17

chroot-env: simplify, clean directories structure

llvm: add debug builds support

In the end I didn't utilize it, but it shouldn't hurt.

Only building was tested.

... to avoid future surprises. Also add libunwind to deps.
I don't know why libxshmfence is no longer detected.

Fix failure of 0.98.0 to compile with NixOS 15.09 (due to referencing a
symbol `IOADDRESS` that has been removed from X.org drivers).

Use the vendored wiredtiger as the system one is not compatible

libressl: 2.2.3 -> 2.2.4

vue: 3.2.2 -> 3.3.0

pyquery: 1.2.4 -> 1.2.9

This release fixes a buffer overrun and a memory leak.

See: http://ftp.openbsd.org/pub/OpenBSD/patches/5.8/common/007_obj2txt.patch.sig

svtplay-dl: 0.20.2015.09.13 -> 0.20.2015.10.08

eclipse-plugin-checkstyle: 6.11.0 -> 6.11.1

eclipse-plugin-testng: 6.9.7 -> 6.9.8

electrum: 2.4.3 -> 2.5.1

fuse-7z-ng: init at git-2014-06-08

The spuriously failing test suite is now disabled by cabal2nix.

These overrides cause an infinite recursion for reasons I don't quite
understand and that don't seem worthwhile to attempt to understand.

This update was generated by hackage2nix v20150922-22-g7ae1e4c using the following inputs:

- Nixpkgs: https://github.com/NixOS/nixpkgs/commit/ecd4f778f13aaf6c0cf738c523c1e426e72a59f7
- Hackage: https://github.com/commercialhaskell/all-cabal-hashes/commit/873ad146ce6200f5b90739a46889a0e13d2678f8
- LTS Haskell: https://github.com/fpco/lts-haskell/commit/0c2d9478c40ebf63cd6ae0f19a84ffaeed4fbe1c
- Stackage Nightly: https://github.com/fpco/stackage-nightly/commit/3f21ac8e0f24870dfadf10d96e32b2ed943efe2e