383c7ce42b
This disables an entirely unnecessary "sanity check" that causes failures in nonblocking mode, because OpenSSL complains if we move or compact the write buffer. The only actual requirement is that we not modify pending data once we've attempted to send it, which we don't. Per testing and research by Martin Pihlak, though this fix is a lot simpler than his patch. I put the same change into the backend, although it's less clear whether it's necessary there. We do use nonblock mode in some situations in streaming replication, so seems best to keep the same behavior in the backend as in libpq. Back-patch to all supported releases.
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