* gnu/packages/patches/ghc-haddock-library-unbundle.patch: New file.
* gnu/packages/haskell.scm (ghc-haddock-library): Update to 1.5.0.1.
[source]: Add the patch; add a snippet to remove the bundled library.
[arguments]: Add a phase to relax test suite dependency constraints and
another to add a missing directory required for tests.
[native-inputs]: Add ghc-base-compat, ghc-optparse-applicative, and
ghc-tree-diff.