release-lib.nix: make packagePlatforms respect badPlatforms

packagePlatforms previously ignored badPlatforms, probably because it is
a fairly [recent] addition. While check-meta.nix doesn't implement it
using subtractLists, it is basically equivalent to the following logic:

  platformSet - badPlatformSet (= effectivePlatformSet)

which we implement using subtractLists (which has somewhat confusing
currying-optimized argument order).

This flaw was discovered when testing #177901 which heavily uses
badPlatforms.

[recent]: b0482248fe

pkgs/top-level/release-lib.nix

@@ -146,7 +146,8 @@ rec {
   packagePlatforms = mapAttrs (name: value:
       if isDerivation value then
         value.meta.hydraPlatforms
-          or (value.meta.platforms or [ "x86_64-linux" ])
+          or (lib.subtractLists (value.meta.badPlatforms or [])
+               (value.meta.platforms or [ "x86_64-linux" ]))
       else if value.recurseForDerivations or false || value.recurseForRelease or false then
         packagePlatforms value
       else