New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/49361#discussion_r1530375929

Comment:
You can add the submodules to `distfiles`, let it fetch, and move them into place in `post_extract`. Using `git --recursive` is not an option here. Take a look at, *e.g.*, `grpc` to see how submodules are handled.