stdenv setup: Always use both propagated files

This continues #23374, which always kept around both attributes, by
always including both propagated files: `propgated-native-build-inputs`
and `propagated-build-inputs`. `nativePkgs` and `crossPkgs` are still
defined as before, however, so this change should only barely
observable.

This is an incremental step to fully keeping the dependencies separate
in all cases.

pkgs/development/perl-modules/generic/builder.sh

@@ -34,8 +34,8 @@ postFixup() {
     # dependencies in the user environment (since Perl modules don't
     # have something like an RPATH, so the only way to find the
     # dependencies is to have them in the PERL5LIB variable).
-    if test -e $out/nix-support/propagated-native-build-inputs; then
-        ln -s $out/nix-support/propagated-native-build-inputs $out/nix-support/propagated-user-env-packages
+    if test -e $out/nix-support/propagated-build-inputs; then
+        ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
     fi
 }