rabbitmq-server: Fix building on Darwin (#371045)

pkgs/by-name/ra/rabbitmq-server/package.nix

@@ -112,7 +112,7 @@ stdenv.mkDerivation rec {
   doInstallCheck = true;
   installCheckPhase = ''
     runHook preInstallCheck
-    out="$(env - LANG=C.utf8 HOME=/build ${placeholder "out"}/bin/rabbitmqctl version)"
+    out="$(env - LANG=C.utf8 HOME=$TMPDIR ${placeholder "out"}/bin/rabbitmqctl version)"
     if [[ "$out" != "$version" ]]; then
       echo "Rabbitmq should report version $version, but thinks it's version $out" >&2
       exit 1
@@ -120,6 +120,9 @@ stdenv.mkDerivation rec {
     runHook postInstallCheck
   '';
 
+  # Needed for the check in installCheckPhase
+  __darwinAllowLocalNetworking = true;
+
   passthru.tests = {
     vm-test = nixosTests.rabbitmq;
   };