Merge pull request #17718 from matthewbauer/patch-7

travis: build stdenv also

maintainers/scripts/travis-nox-review-pr.sh

···
             echo "=== Fetching Nox from binary cache"
 
             # build nox silently so it's not in the log
-            nix-build "<nixpkgs>" -A nox
+            nix-build "<nixpkgs>" -A nox -A stdenv
             ;;
 
         pr)