unbound: also replace -R in libunbound.la

This was increasing closure sizes as well.

pkgs/tools/networking/unbound/default.nix

@@ -40,7 +40,7 @@ stdenv.mkDerivation rec {
     # get rid of runtime dependencies on $dev outputs
   + ''substituteInPlace "$lib/lib/libunbound.la" ''
     + stdenv.lib.concatMapStrings
-      (pkg: " --replace '-L${pkg.dev}/lib' '-L${pkg.out}/lib' ")
+      (pkg: " --replace '-L${pkg.dev}/lib' '-L${pkg.out}/lib' --replace '-R${pkg.dev}/lib' '-R${pkg.out}/lib'")
       buildInputs;
 
   meta = with stdenv.lib; {