sandbox: Add an option to set up /bin/sh

So far I mostly used this implementation for the games we have packaged,
where we pretty much patch out all commands that execute external
programs.

However in order to be useful in a more generic way, it makes sense to
provide a /bin/sh implementation, especially when you have to deal with
scripting languages.

I'm using dash here, because it's a more minimal implementation rather
than the default shell (bash) we use in nixpkgs and it practically only
needs to be able to run constructs like "/bin/sh -c foo".

Signed-off-by: aszlig <aszlig@nix.build>

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