* Argument support in Fix. Arguments can be passed through the

builder using the `args' binding:

  ("args", ["bla", True, IncludeFix("aterm/aterm.fix")])

  Note that packages can also be declared as inputs by specifying them
  in the argument list.

testpkgs/args/args.fix

@@ -0,0 +1,7 @@
+Package(
+  [ ("name", "args")
+  , ("build", Relative("args/args-build.sh"))
+
+  , ("args", ["1", "2", "3", IncludeFix("slow2/slow.fix")])
+  ]
+)