[commit: ghc] ghc-8.6's head updated: Revert "Amend configure script to support lndir build tree" (d55035f)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

Branch 'ghc-8.6' now includes:

     60e4bb4 Enhanced constant folding
     d55035f Revert "Amend configure script to support lndir build tree"