apple-sdk-11.0: add Apple80211 private framework

pkgs/os-specific/darwin/apple-sdk-11.0/private-frameworks.nix

···
 # generated by hand to avoid exposing all private frameworks
 # frameworks here are only the necessary ones used by public frameworks.
 {
+  Apple80211 = {};
   AVFCapture = {};
   AVFCore = {};
   AddressBookCore = { inherit ContactsPersistence; };