xinetd: fix build w/glibc-2.32

pkgs/servers/xinetd/default.nix

@@ -1,4 +1,4 @@
-{ fetchurl, fetchpatch, stdenv }:
+{ fetchurl, fetchpatch, stdenv, libtirpc }:
 
 stdenv.mkDerivation rec {
   name = "xinetd-2.3.15";
@@ -16,6 +16,11 @@ stdenv.mkDerivation rec {
     })
   ];
 
+  buildInputs = [ libtirpc ];
+
+  NIX_CFLAGS_COMPILE = [ "-I${libtirpc.dev}/include/tirpc" ];
+  NIX_LDFLAGS = [ "-ltirpc" ];
+
   meta = {
     description = "Secure replacement for inetd";
     platforms = stdenv.lib.platforms.linux;