[Toybox] [PATCH] inline CRC64 checks in xzcat

[Isaac]

This inlines CRC64, and nothing more.
The functions involved were called only once.
--
Tested to build and to decompress a tarball 
(./toybox xzcat < some.tar.xz |shasum; xzcat <some.tar.xz |shasum)
Patch is against 0.4.5/commit 942.

I intend to remove XZ_PREALLOC/XZ_SINGLE, since we're not using them and
probably won't due to how low-level they are.
Also on my agenda is changing the main loop to recognize filenames, 
probably via loopfiles() like bzcat does.


HTH,
Isaac Dunham
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