thttpd: fix build with libxcrypt

pkgs/servers/http/thttpd/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl }:
+{ lib, stdenv, fetchurl, libxcrypt }:
 
 stdenv.mkDerivation rec {
   pname = "thttpd";
@@ -14,6 +14,10 @@ stdenv.mkDerivation rec {
     sed -i -e 's/chmod 2755/chmod 755/' extras/Makefile.in
   '';
 
+  buildInputs = [
+    libxcrypt
+  ];
+
   preInstall = ''
     mkdir -p "$out/man/man1"
     sed -i -e 's/-o bin -g bin *//' Makefile