Change collage haskell build steps

examples/basic-example/collage

@@ -10,7 +10,7 @@
   {
     name "haskell-sample"
     dir "s2"
-    cmd [ "cabal new-build" ]
+    cmd [ "rm -rf dist-newstyle" "cabal new-build" ]
     expose (sections "Main.hs")
   }