libstatgrab: enable building saidar by default (#395259)

pkgs/development/libraries/libstatgrab/default.nix

@@ -2,7 +2,9 @@
   lib,
   stdenv,
   fetchurl,
+  withSaidar ? true,
   IOKit,
+  ncurses,
 }:
 
 stdenv.mkDerivation rec {
@@ -14,7 +16,8 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-VoiqSmhVR9cXSoo3PqnY7pJ+dm48wwK97jRSPCxdbBE=";
   };
 
-  buildInputs = lib.optional stdenv.hostPlatform.isDarwin IOKit;
+  buildInputs =
+    (lib.optional stdenv.hostPlatform.isDarwin IOKit) ++ (lib.optional withSaidar ncurses);
 
   meta = with lib; {
     homepage = "https://www.i-scream.org/libstatgrab/";