Kill code to ensure that our pipe is open before we write to the other
Kill code to ensure that our pipe is open before we write to the other

In practice, this appears to be both unnecessary and harmful. Although
the first write happens effectively instantaneously, we can take
several hundred milliseconds to read the second write, and Standalone
can decide we are dead.

This apparently fixes #783 for @dstillman, although I was never able to
reproduce locally.

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