install-docs trouble

After the recent "package ghc"-related changes, "make" now decides to descend
into ghc/compiler for the install-docs target and this fails in dozens of
wonderful ways, because the compiler itself is not Haddock-ready for various
reasons (too many commas in export lists, '-- *' in comments, '$blah' in comments,
etc.).

I don't have a clue how to fix this correctly (Disable doc generation there?
Fix the compiler sources? ...), so I leave this to the Simons.

Cheers,
    S.