Merge pull request #35338 from dtzWill/feature/release-cross-nixen

release-cross: add nix and nixUnstable

Changed files
+2
pkgs
top-level
+2
pkgs/top-level/release-cross.nix
···
buildPackages.binutils = nativePlatforms;
gmp = nativePlatforms;
libcCross = nativePlatforms;
+
nix = nativePlatforms;
+
nixUnstable = nativePlatforms;
};
gnuCommon = lib.recursiveUpdate common {