Merge pull request #194439 from hercules-ci/fix-python3Packages.libvirt-build-on-darwin

pkgs/development/libraries/libvirt/default.nix

···
 
   patches = [
     ./0001-meson-patch-in-an-install-prefix-for-building-on-nix.patch
+  ] ++ lib.optionals enableZfs [
     (substituteAll {
       src = ./0002-substitute-zfs-and-zpool-commands.patch;
       zfs = "${zfs}/bin/zfs";