patch which implements ZFS LZ4 compression

[Xin Li]

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For those who are inpatient, here is an overlay for LZ4 for 9-STABLE.

http://people.freebsd.org/~delphij/misc/lz4.tar.xz

Overwrite /usr/src and recompile ZFS module.

Note: before using this in any serious environment, please be sure to
test if there is any data corruption by comparing the files copied to
a LZ4 dataset after export and re-import the pool, or reboot.  I have
only tested the code on amd64 and would like to see if it works on big
endian environment, etc.

Cheers,
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