findutils: Fix cross compilation

Yes, setting crossAttrs.propagatedBuildInputs is the correct value to
set to override a buildInputs from the native drv!

pkgs/tools/misc/findutils/default.nix

@@ -18,8 +18,8 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "info" ];
 
   crossAttrs = {
-    # http://osdir.com/ml/bug-findutils-gnu/2009-08/msg00026.html
+    # Fix the 'buildInputs = [ coreutils ]' above - that adds the cross coreutils to PATH :(
-    configureFlags = [ "gl_cv_func_wcwidth_works=yes" ];
+    propagatedBuildInputs = [ ];
   };
 
   enableParallelBuilding = true;