treewide: Get rid of all uses of crossConfig

The hack of using `crossConfig` to enforce stricter handling of
dependencies is replaced with a dedicated `strictDeps` for that purpose.
(Experience has shown that my punning was a terrible idea that made more
difficult and embarrising to teach teach.)

Now that is is clear, a few packages now use `strictDeps`, to fix
various bugs:

 - bintools-wrapper and cc-wrapper

pkgs/tools/misc/bc/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
   # Hack to make sure we never to the relaxation `$PATH` and hooks support for
   # compatability. This will be replaced with something clearer in a future
   # masss-rebuild.
-  crossConfig = true;
+  strictDeps = true;
 
   meta = {
     description = "GNU software calculator";