bug#67022: Gzip decompression can be 60% faster using zlib's CRC32

[wrotycz]

I tried to implement this slice-by-8 CRC but couldn't do it the way I 
wanted - without bloated zlib tables and stuff. Maybe because I don't get 
what updcrc(), getcrc(), setcrc() are and what they actually do. The whole 
program is magical, there is no way to find do_de/compress(), nor anything like 
that, so it was difficult to actually find relevant code. But anyway, for a 
start I manged to make `makecrcs8.c' to generate CRCs lookup table 
(attached).   Regards  wrotycz

makecrcs8.c
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