http: allow headers/trailers to be written byte-wise

This allows clients to trickle headers and trailers.  While
Unicorn itself does not support slow clients for many reasons,
this affects servers that depend on our parser like Rainbows!.
This actually does affect Unicorn when handling trailers, but
HTTP trailers are very ever rarely used in requests.

Fortunately this stupid bug does not seem able to trigger
out-of-bounds conditions.

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