http: use bigger, but shorter-lived buffers for pipes

Linux pipes default to 65536 bytes in size, and we want to read
external processes as fast as possible now that we don't use
Danga::Socket or buffer to heap.

However, drop the buffer ASAP if we need to wait on anything;
since idle buffers can be idle for eons.  This lets other
execution contexts can reuse that memory right away.

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