[Nix-dev] Hydra.

[Michael Raskin]

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		Hello.
	I have added an expression to release.nix to build packages with
specified non-empty meta.maintainers and meta.platforms. Currently, it
works. However, there are a few problems.

	There are some packages that have "early assertions" - i.e. they want
to be built only on some platforms. Unfortunately, simply checking for
meta of such a package is impossible.
	What to do with them in general? I have wrapped them in some
conditionals, so the assertions are impossible to trigger.
	Such an assertion is impossible to override with a later // {meta=...}
. So a failure will bring down all the evaluation (like with old
buildfarm). That looks unfortunate.
	Maybe we should add a possibility to trap all exceptions/assertions
_without_ distinguishing them? It seems to be a clean check.
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