Revert "stdenv: set NIX_DONT_SET_RPATH_FOR_TARGET on Darwin" (#355667)

pkgs/stdenv/generic/default.nix

@@ -114,9 +114,17 @@ let
         export NIX_NO_SELF_RPATH=1
       '' + lib.optionalString (hostPlatform.isDarwin && hostPlatform.isMacOS) ''
         export MACOSX_DEPLOYMENT_TARGET=${hostPlatform.darwinMinVersion}
-      '' + lib.optionalString targetPlatform.isDarwin ''
-        export NIX_DONT_SET_RPATH_FOR_TARGET=1
-      '';
+      ''
+      # TODO this should be uncommented, but it causes stupid mass rebuilds due to
+      # `pkgsCross.*.buildPackages` not being the same, resulting in cross-compiling
+      # for a target rebuilding all of `nativeBuildInputs` for that target.
+      #
+      # I think the best solution would just be to fixup linux RPATHs so we don't
+      # need to set `-rpath` anywhere.
+      # + lib.optionalString targetPlatform.isDarwin ''
+      #   export NIX_DONT_SET_RPATH_FOR_TARGET=1
+      # ''
+      ;
 
       inherit initialPath shell
         defaultNativeBuildInputs defaultBuildInputs;