[PATCH] add pkzip support for gzio

[y.volta]

hi,

    i've made a little patch for pkziped ( deflate mode ) file. by using this, 
we can have both gunzip and pkunzip supported: they have only header different 
with the same file. ;-)

    please note, if your file is too small, pkzip will not compress it but 
store the orginal data to the output file.

y.volta

gzio.patch
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