google-cloud-sdk/components: use fetchurl instead of builtins.fetchurl

These URLs don't need to be fetched at evaluation time. This change speeds up evaluation considerably for these components and allows them to be used in Hydra.

pkgs/tools/admin/google-cloud-sdk/components.nix

@@ -1,5 +1,6 @@
 { lib
 , stdenv
+, fetchurl
 , system
 , snapshotPath
 , autoPatchelfHook
@@ -137,7 +138,7 @@ let
       inherit pname version snapshot;
       src =
         lib.optionalString (src != "")
-          (builtins.fetchurl
+          (fetchurl
             {
               url = src;
               inherit sha256;