Revert "darwin 10.12 commits"

Reverts commits bumping to macOS stuff to 10.12:

commit ec1f78d1cb.
commit d0dc91d24f.
commit a1d297374d.
commit 425112151d.
commit e6f7f2928f.

pkgs/os-specific/darwin/apple-source-releases/diskdev_cmds/default.nix

@@ -1,9 +1,9 @@
 { stdenv, appleDerivation, xcbuildHook
-, Libc, xnu, libutil }:
+, Libc, xnu, libutil-new }:
 
 appleDerivation {
   nativeBuildInputs = [ xcbuildHook ];
-  buildInputs = [ libutil ];
+  buildInputs = [ libutil-new ];
 
   NIX_CFLAGS_COMPILE = "-I.";
   NIX_LDFLAGS = "-lutil";