Make WebKit use libsoup 2.31.2 via deepOverride. Edit a few packages that were overridable but did not allow extra arguments. Remove a catch with deepOverride that pkgs.lib had this attribute in a different sense.

svn path=/nixpkgs/trunk/; revision=22529

pkgs/os-specific/linux/hal/default.nix

@@ -3,6 +3,7 @@
 , perlXMLParser, gettext, zlib, gperf, consolekit, policykit
 , libsmbios, dmidecode, udev, utillinuxng, pmutils, usbutils
 , eject
+, ...
 }:
 
 assert stdenv ? glibc;