Haddock: Don't pass --quickjump uncoditionally

Fix #9060 and improve #8326, i.e. with GHC < 9.4 `cabal haddock
--enable-doc` works in more situations. #8326 is not fixed because
`cabal haddock --enable-doc --haddock-for-hackage` still fails
and doesn't seem to be fixable without upgrading to a newer
GHC (9.4+) and Haddock.

Cabal/src/Distribution/Simple/Haddock.hs

@@ -867,7 +867,7 @@ renderPureArgs version comp platform args =
             $ args
         else []
     , ["--since-qual=external" | isVersion 2 20]
-    , [ "--quickjump" | isVersion 2 19, _ <- flagToList . argQuickJump $ args
+    , [ "--quickjump" | isVersion 2 19, True <- flagToList . argQuickJump $ args
       ]
     , [ "--hyperlinked-source" | isVersion 2 17, True <- flagToList . argLinkedSource $ args
       ]