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/build-support/cc-wrapper/default.nix

@@ -6,8 +6,10 @@
 # compiler and the linker just "work".
 
 { name ? ""
-, stdenvNoCC, nativeTools, propagateDoc ? !nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
+, stdenvNoCC
 , cc ? null, libc ? null, bintools, coreutils ? null, shell ? stdenvNoCC.shell
+, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
+, propagateDoc ? cc != null && cc ? man
 , extraPackages ? [], extraBuildCommands ? ""
 , isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
 , buildPackages ? {}