protobuf: remove old versions

This leaves only protobuf3_1 which is the last version with libprotobuf2.

Also fix several packages to build with the latest protobuf.

pkgs/development/libraries/protobuf/2.5.nix

@@ -1,10 +0,0 @@
-{ callPackage, fetchurl, ... } @ args:
-
-callPackage ./generic.nix (args // rec {
-  version = "2.5.0";
-  # make sure you test also -A pythonPackages.protobuf
-  src = fetchurl {
-    url = "http://protobuf.googlecode.com/files/${version}.tar.bz2";
-    sha256 = "0xxn9gxhvsgzz2sgmihzf6pf75clr05mqj6218camwrwajpcbgqk";
-  };
-})

pkgs/development/libraries/protobuf/2.6.nix

@@ -1,12 +0,0 @@
-{ callPackage, fetchFromGitHub, ... } @ args:
-
-callPackage ./generic.nix (args // rec {
-  version = "2.6.1";
-  # make sure you test also -A pythonPackages.protobuf
-  src = fetchFromGitHub {
-    owner = "google";
-    repo = "protobuf";
-    rev = "v${version}";
-    sha256 = "03df8zvx2sry3jz2x4pi3l32qyfqa7w8kj8jdbz30nzy0h7aa070";
-  };
-})

pkgs/development/libraries/protobuf/3.0.0-beta-2.nix

@@ -1,6 +0,0 @@
-{ callPackage, ... }:
-
-callPackage ./generic-v3.nix {
-  version = "3.0.0-beta-2";
-  sha256 = "0cbr1glgma5vakabsjwcs41pcnn8yphhn037l0zd121zb9gdaqc1";
-}

pkgs/development/libraries/protobuf/3.0.nix

@@ -1,6 +0,0 @@
-{ callPackage, ... }:
-
-callPackage ./generic-v3.nix {
-  version = "3.0.2";
-  sha256 = "16wmr1fgdqpf84fkq90cxvccfsxx7h0q0wzqkbg8vdjmka412g09";
-}

pkgs/development/libraries/protobuf/3.2.nix

@@ -1,6 +0,0 @@
-{ callPackage, lib, ... }:
-
-lib.overrideDerivation (callPackage ./generic-v3.nix {
-  version = "3.2.0";
-  sha256 = "120g0bg7ichry74allgmqnh7k0z2sdnrrfklb58b7szzn4zcdz14";
-}) (attrs: { NIX_CFLAGS_COMPILE = "-Wno-error"; })

pkgs/development/libraries/protobuf/3.3.nix

@@ -1,6 +0,0 @@
-{ callPackage, lib, ... }:
-
-lib.overrideDerivation (callPackage ./generic-v3.nix {
-  version = "3.3.0";
-  sha256 = "1258yz9flyyaswh3izv227kwnhwcxn4nwavdz9iznqmh24qmi59w";
-}) (attrs: { NIX_CFLAGS_COMPILE = "-Wno-error"; })