guile-git: enable tests on Darwin

pkgs/by-name/gu/guile-git/package.nix

@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
   propagatedBuildInputs = [
     libgit2 scheme-bytestructures
   ];
-  doCheck = !stdenv.hostPlatform.isDarwin;
+  doCheck = true;
   makeFlags = [ "GUILE_AUTO_COMPILE=0" ];
 
   enableParallelBuilding = true;
@@ -45,6 +45,8 @@ stdenv.mkDerivation rec {
     sed -i -e '94i (test-skip 1)' ./tests/proxy.scm
   '';
 
+  __darwinAllowLocalNetworking = true;
+
   meta = with lib; {
     description = "Bindings to Libgit2 for GNU Guile";
     homepage = "https://gitlab.com/guile-git/guile-git";