Increase BUFSIZ to 8192

[Poul-Henning Kamp]

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In message <20150514075316.GY37063 at funkthat.com>, John-Mark Gurney writes:
>Poul-Henning Kamp wrote this message on Thu, May 14, 2015 at 07:42 +0000:
>> --------
>> In message <20150514072155.GT37063 at funkthat.com>, John-Mark Gurney writes:
>> 
>> >Since you apprently missed my original reply, I said that we shouldn't
>> >abuse BUFSIZ for this work, and that it should be changed in mdXhl.c...
>> 
>> Say what ?
>> 
>> BUFSIZ is used entirely appropriately in MDXFileChunk():  For reading
>> a file into an algorithm.

>In fact, posix-2008 references LINE_MAX because:

MDXFileChunk() does not read lines, it reads an entire file.

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