iucode-tool: add argp-standalone buildInput on musl (#217202)

pkgs/os-specific/linux/microcode/iucode-tool.nix

···
-{ lib, stdenv, fetchFromGitLab, autoreconfHook, fetchpatch }:
+{ lib, stdenv, fetchFromGitLab, autoreconfHook, fetchpatch, argp-standalone }:
 
 stdenv.mkDerivation rec {
   pname = "iucode-tool";
···
   ];
 
   nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = lib.optional stdenv.hostPlatform.isMusl argp-standalone;
 
   enableParallelBuilding = true;