release-cross: Cross compile from all 3 supported platforms

pkgs/top-level/release-cross.nix

@@ -2,7 +2,7 @@
 */
 
 { # The platforms *from* which we cross compile.
-  supportedSystems ? [ "x86_64-linux" "x86_64-darwin" ]
+  supportedSystems ? [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" ]
 , # Strip most of attributes when evaluating to spare memory usage
   scrubJobs ? true
 }:
@@ -10,7 +10,7 @@
 with import ./release-lib.nix { inherit supportedSystems scrubJobs; };
 
 let
-  nativePlatforms = linux;
+  nativePlatforms = all;
 
   common = {
     buildPackages.binutils = nativePlatforms;