builtins.nixVersion: return fixed fake version

This builtin is only going to cause us problems because we are not Nix,
so let's just falsify being in the 2.18 series, since that is the
closest target that has any meaning.

In future we might want to have a better feature detection mechanism,
for when we actually add stuff to some builtin's attr set argument. But
builtins.nixVersion is just going to be hopelessly broken and it should
be stubbed out.

Fixes https://git.lix.systems/lix-project/lix/issues/144

Change-Id: Id7390b32a29c6147f2977737d81846320de5d67e

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