Make test suite correctly infer haddock location from ghc.
Make test suite correctly infer haddock location from ghc.

Previously, configCompilerEx was setting Haddock as known,
but not actually configuring it; thus, later when we
required haddockProgram, we configured the WRONG program.
By configuring known programs, we can fix this problem.

Signed-off-by: Edward Z. Yang <dbd597f5635f432486c5d365e9bb585b3eaa1853@cs.stanford.edu>

mydaum/cabal,themoritz/cabal,mydaum/cabal,themoritz/cabal,themoritz/cabal