Update repository sub-dir for ghc-heap in ghc-heap.cabal.in

Reviewers: bgamari

Reviewed By: bgamari

Subscribers: rwbarton, thomie, carter

Differential Revision: https://phabricator.haskell.org/D4735

libraries/ghc-heap/ghc-heap.cabal.in

@@ -17,7 +17,7 @@ tested-with:    GHC==7.11
 source-repository head
   type:     git
   location: http://git.haskell.org/ghc.git
-  subdir:   libraries/heapview
+  subdir:   libraries/ghc-heap
 
 library
   default-language: Haskell2010