samba.org wrappers: fix builds by a hack

pkgs/development/libraries/nss_wrapper/default.nix

@@ -9,7 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "1jka6d873vhvfr7k378xvgxmbpka87w33iq6b91ynwg36pz53ifw";
   };
 
-  buildInputs = [ cmake pkgconfig ];
+  buildInputs = [ cmake pkgconfig (stdenv.cc.libc.out or null) ];
+  # outputs TODO: missing glibc.out might become a general problem
 
   meta = with stdenv.lib; {
     description = "A wrapper for the user, group and hosts NSS API";