zip: disable nls patch by default.

This patch breaks zip -y (symlinks are turned into regular files).

See https://bugs.gentoo.org/show_bug.cgi?id=571676#c4

pkgs/tools/archivers/zip/default.nix

···
-{ stdenv, fetchurl, enableNLS ? true, libnatspec ? null, libiconv }:
+{ stdenv, fetchurl, enableNLS ? false, libnatspec ? null, libiconv }:
 
 assert enableNLS -> libnatspec != null;