mkNugetDeps: provide default for nugetDeps

pkgs/build-support/dotnet/build-dotnet-module/default.nix

@@ -114,7 +114,6 @@ let
       then nugetDeps
       else mkNugetDeps {
         inherit name;
-        nugetDeps = import nugetDeps;
         sourceFile = nugetDeps;
       }
     else throw "Defining the `nugetDeps` attribute is required, as to lock the NuGet dependencies. This file can be generated by running the `passthru.fetch-deps` script.";

pkgs/build-support/dotnet/make-nuget-deps/default.nix

@@ -1,5 +1,5 @@
 { linkFarmFromDrvs, fetchurl }:
-{ name, nugetDeps, sourceFile ? null }:
+{ name, nugetDeps ? import sourceFile, sourceFile ? null }:
 linkFarmFromDrvs "${name}-nuget-deps" (nugetDeps {
   fetchNuGet = { pname, version, sha256
     , url ? "https://www.nuget.org/api/v2/package/${pname}/${version}" }: