prometheus-dnsmasq-exporter: fix build on darwin

pkgs/servers/monitoring/prometheus/dnsmasq-exporter.nix

@@ -1,4 +1,4 @@
-{ stdenv, buildGoModule, fetchFromGitHub }:
+{ stdenv, buildGoModule, fetchFromGitHub, Security }:
 
 buildGoModule rec {
   pname = "dnsmasq_exporter";
@@ -13,6 +13,8 @@ buildGoModule rec {
 
   modSha256 = "1ag1k0z35zkazaxj8hh2wxfj73xg63xdybfm1565il2vxs5986dh";
 
+  buildInputs = stdenv.lib.optionals stdenv.isDarwin [ Security ];
+
   meta = with stdenv.lib; {
     inherit (src.meta) homepage;
     description = "A dnsmasq exporter for Prometheus";