bintools-wrapper, cc-wrapper, stdenv: infer propagateDoc automatically

02c09e0171 (NixOS/nixpkgs#44558) was reverted in
c981787db9 but, as it turns out, it fixed an issue
I didn't know about at the time: the values of `propagateDoc` options were
(and now again are) inconsistent with the underlying things those wrappers wrap
(see NixOS/nixpkgs#46119), which was (and now is) likely to produce more instances
of NixOS/nixpkgs#43547, if not now, then eventually as stdenv changes.

This patch (which is a simplified version of the original reverted patch) is the
simplest solution to this whole thing: it forces wrappers to directly inspect the
outputs of the things they are wrapping instead of making stdenv guess the correct
values.

pkgs/stdenv/darwin/default.nix

@@ -88,7 +88,6 @@ in rec {
         extraPackages = lib.optional (libcxx != null) libcxx;
 
         nativeTools  = false;
-        propagateDoc = false;
         nativeLibc   = false;
         inherit buildPackages coreutils gnugrep bintools;
         libc         = last.pkgs.darwin.Libsystem;