make-derivation: install all outputs

This confuses users too much and to me seems to have very little
benefit. Since it only effect “declarative” installation, it doesn’t
seem helpful to not give every output available. In this case, users
want what would normally be included in the /zlib/ package, not just
one output.

Fixes NixOS#44144
Fixes NixOS#24717

pkgs/stdenv/generic/make-derivation.nix

@@ -253,17 +253,14 @@ rec {
           # lets have a clean always accessible version here.
           inherit name;
 
-          # If the packager hasn't specified `outputsToInstall`, choose a default,
-          # which is the name of `p.bin or p.out or p`;
-          # if he has specified it, it will be overridden below in `// meta`.
-          #   Note: This default probably shouldn't be globally configurable.
-          #   Services and users should specify outputs explicitly,
-          #   unless they are comfortable with this default.
-          outputsToInstall =
-            let
-              outs = outputs'; # the value passed to derivation primitive
-              hasOutput = out: builtins.elem out outs;
-            in [( lib.findFirst hasOutput null (["bin" "out"] ++ outs) )];
+          # By default, just install all outputs. This would
+          # previously only install one output, but this led to much
+          # confusion from users expecting all of the outputs to be
+          # available. If you do not wants to make every output
+          # available, individual packages can still specify a
+          # default. Notice that this will only affect “nix-env -i”
+          # and not normal Nixpkgs dependency behavior.
+          outputsToInstall = outputs';
         }
         // attrs.meta or {}
         # Fill `meta.position` to identify the source location of the package.