Increase BUFSIZ to 8192

[Poul-Henning Kamp]

--------
In message <20150512032307.GP37063 at funkthat.com>, John-Mark Gurney writes:

>Also, you'd probably see even better performance by increasing the
>size to 64k, [...]

easy:
	8K on 32bit
	64k on 64bit

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Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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