Hadrian test looks a state of tree to determine whether documentation is available

hadrian test exhibits an rather surprising behavior. Namely, this:

hadrian/build-cabal
hadrian/build-cabal test

and

hadrian/build-cabal
hadrian/build-cabal docs
hadrian/build-cabal test

are not equivalent.

The reason is that Hadrian does not look at the build configuration to determine whether haddock is available; rather, it checks whether the build documentation files happen to exist. Surprisingly, these are not build during the default build. This means that tests which are marked as req_haddock do not build unless you first explicitly build the docs target. This took far too long to discover.

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