Bump haddock submodule
Bump haddock submodule

Install files necessary for --hyperlinked-source. Fixes #11949.

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