virtualbox+guest: Update to new version 4.3.28.

Contains quite a lot of fixes, so for information and details about
them, please have a look at https://www.virtualbox.org/wiki/Changelog.

We also needed to drop the hunk about NATNetworkServiceRunner.cpp in the
hardened.patch, because the file was unused and thus has been removed
from upstream in r54821:

https://www.virtualbox.org/changeset?reponame=vbox&new=54821

Tested successfully against nixos/tests/virtualbox.nix.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/applications/virtualization/virtualbox/default.nix

@@ -14,7 +14,7 @@ with stdenv.lib;
 let
   buildType = "release";
 
-  version = "4.3.26"; # changes ./guest-additions as well
+  version = "4.3.28"; # changes ./guest-additions as well
 
   forEachModule = action: ''
     for mod in \
@@ -35,13 +35,13 @@ let
   '';
 
   # See https://github.com/NixOS/nixpkgs/issues/672 for details
-  extpackRevision = "98988";
+  extpackRevision = "100309";
   extensionPack = requireFile rec {
     name = "Oracle_VM_VirtualBox_Extension_Pack-${version}-${extpackRevision}.vbox-extpack";
     # IMPORTANT: Hash must be base16 encoded because it's used as an input to
     # VBoxExtPackHelperApp!
     # Tip: see http://dlc.sun.com.edgesuite.net/virtualbox/4.3.10/SHA256SUMS
-    sha256 = "4e39a6d0da23799a31c3f6a4022b144ef3ddfe30c523e51b21bf7d9ebade62ce";
+    sha256 = "72e101d9dc5eabeb76d1ab5bd6d2f817a11c89adfe8bb72cc5d614a2eef532d1";
     message = ''
       In order to use the extension pack, you need to comply with the VirtualBox Personal Use
       and Evaluation License (PUEL) by downloading the related binaries from:
@@ -60,7 +60,7 @@ in stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VirtualBox-${version}.tar.bz2";
-    sha256 = "e2949c250a1de30997e658de9e3d8545e71318a9844d80536137d76db4f08961";
+    sha256 = "e157ab76d1958ae2c56b2a3875194fbff3de82486ad0e30032fd5bd772297c31";
   };
 
   buildInputs =