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/linux/default.nix

@@ -92,7 +92,6 @@ let
              else lib.makeOverridable (import ../../build-support/cc-wrapper) {
           name = "${name}-gcc-wrapper";
           nativeTools = false;
-          propagateDoc = false;
           nativeLibc = false;
           buildPackages = lib.optionalAttrs (prevStage ? stdenv) {
             inherit (prevStage) stdenv;