Patch that defines MAXBCACHEBUF separate from MAXBSIZE for review

[Rick Macklem]

Hi,

MAXBSIZE is both the maximum UFS block size and the maximum size
of a buffer cache block. This patch defines MAXBCACHEBUF as a
separate constant that is the maximum size of a buffer cache block.
This allows it to be set on a per-architecture basis and, therefore,
can be made larger than MAXBSIZE so that the NFS client can do larger
reads/writes, for 64bit architectures.

The patch is here for review:
  https://reviews.freebsd.org/D2330
and is also attached.

Since I've never used Phabricator, I suspect it's messed up, but
just email if you want to review this or comment and can't do it
in phabricator.

rick
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