make-socket-pair: remember to flush

As I suspected, make-socket-pair worked just fine. I discovered this yesterday when I set the input and output buffer sizes to 1. Then, I had the sinking sensation that while I’d already tried flushing the buffer, I had been flushing the wrong side.

I think one of the side items that should come out of erlang-in-lisp is a simple iolib tutorial.

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