Bump haddock submodule
Bump haddock submodule

This includes various fixes to Haddock's integration with the GHC build
system.

snoyberg/ghc,vTurbine/ghc,shlevy/ghc,vTurbine/ghc,sgillespie/ghc,shlevy/ghc,vTurbine/ghc,olsner/ghc,olsner/ghc,snoyberg/ghc,mettekou/ghc,shlevy/ghc,snoyberg/ghc,shlevy/ghc,shlevy/ghc,olsner/ghc,olsner/ghc,vikraman/ghc,ezyang/ghc,vikraman/ghc,sgillespie/ghc,sgillespie/ghc,olsner/ghc,mettekou/ghc,ezyang/ghc,snoyberg/ghc,mettekou/ghc,shlevy/ghc,sgillespie/ghc,vikraman/ghc,ezyang/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,vikraman/ghc,sgillespie/ghc,shlevy/ghc,mettekou/ghc,snoyberg/ghc,olsner/ghc,sdiehl/ghc,mettekou/ghc,snoyberg/ghc,vikraman/ghc,sgillespie/ghc,vTurbine/ghc,mettekou/ghc,mettekou/ghc,vikraman/ghc,sdiehl/ghc,vTurbine/ghc,sdiehl/ghc,sdiehl/ghc,vTurbine/ghc,sgillespie/ghc,ezyang/ghc,olsner/ghc,vikraman/ghc,sdiehl/ghc,vTurbine/ghc,snoyberg/ghc,ezyang/ghc