Update HOL Light to rev 157
perl-GD: update to version 2.49 in a blind attempt to fix test suite failures on x86-linux
releaseTools: Add ‘aggregate’ function

An aggregate is a trivial build that depends on other builds.  This is
intended to provide a declarative replacement of Hydra's "view"
mechanism.

For instance, you can define an aggregate named "critical" that
depends on a selected set of jobs:

  critical = releaseTools.aggregate
    { name = "foo-${tarball.version}";
      members =
        [ tarball
          build.x86_64-linux
          ...
        ];
      meta.description = "Release-critical builds";
    };

The "critical" build will only succeed if all its members
(dependencies) succeed.
Make Nixpkgs jobs unique

That is, there are now distinct jobs like ‘coreutils.x86_64-linux’ and
‘coreutils.x86_64-darwin’, rather than a single job ‘coreutils’ with
multiple builds.  This means that testing a job is simpler:

  $ nix-build pkgs/top-level/release.nix -A coreutils.x86_64-linux

See https://github.com/NixOS/hydra/issues/60 for the motivation.
Remove broken ‘removeList’ function
Only return Hydra jobs for supported platforms
eval-release.nix: Handle the new job structure

Now that we don't need to pass "system" arguments anymore, this thing
is *almost* obsolete.  (Except for the need to handle assertion
failures, you could just do "nix-instantiate --eval-only ..." on
release.nix.)
Add an "unstable" aggregate to replace the "unstable" view

Views are obsolete, aggregates are the declarative replacement.
Fix comment
release-lib.nix: Make the set of supported platforms an argument
iproute2: Update to 3.8.0
gimp: update from 2.8.2 to 2.8.4
nixUnstable: Bump
dropbox: add x86 support
latest git version of gimp
Merge commit 'refs/top-bases/experimental/gimp-git' into experimental/gimp-git

* commit 'refs/top-bases/experimental/gimp-git':
  dropbox: add x86 support
  nixUnstable: Bump
  gimp: update from 2.8.2 to 2.8.4
  iproute2: Update to 3.8.0
  release-lib.nix: Make the set of supported platforms an argument
  Fix comment
  Add an "unstable" aggregate to replace the "unstable" view
  eval-release.nix: Handle the new job structure
  Only return Hydra jobs for supported platforms
  Remove broken ‘removeList’ function
  Make Nixpkgs jobs unique
  releaseTools: Add ‘aggregate’ function
  perl-GD: update to version 2.49 in a blind attempt to fix test suite failures on x86-linux
Merge branch 'master' into refs/top-bases/experimental/gutenprint

* master:
  dropbox: add x86 support
  nixUnstable: Bump
  gimp: update from 2.8.2 to 2.8.4
  iproute2: Update to 3.8.0
  release-lib.nix: Make the set of supported platforms an argument
  Fix comment
  Add an "unstable" aggregate to replace the "unstable" view
  eval-release.nix: Handle the new job structure
  Only return Hydra jobs for supported platforms
  Remove broken ‘removeList’ function
  Make Nixpkgs jobs unique
  releaseTools: Add ‘aggregate’ function
  perl-GD: update to version 2.49 in a blind attempt to fix test suite failures on x86-linux
Merge branch 'experimental/gimp-git' into refs/top-bases/experimental/gutenprint

* experimental/gimp-git:
  latest git version of gimp
Merge commit 'refs/top-bases/experimental/gutenprint' into experimental/gutenprint

* commit 'refs/top-bases/experimental/gutenprint':
  latest git version of gimp
  dropbox: add x86 support
  nixUnstable: Bump
  gimp: update from 2.8.2 to 2.8.4
  iproute2: Update to 3.8.0
  release-lib.nix: Make the set of supported platforms an argument
  Fix comment
  Add an "unstable" aggregate to replace the "unstable" view
  eval-release.nix: Handle the new job structure
  Only return Hydra jobs for supported platforms
  Remove broken ‘removeList’ function
  Make Nixpkgs jobs unique
  releaseTools: Add ‘aggregate’ function
  perl-GD: update to version 2.49 in a blind attempt to fix test suite failures on x86-linux
fetchsvn: Add ignoreExternals attribute.

There are some SVN repositories out there which don't have revision information
tied to externals. By using ignoreExternals, fetchsvn won't fetch these
externals anymore, so the fetch won't fail with a checksum mismatch, should
there be some changes in some of those external repositories.

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