[gzip.c] removed fix for '/' vs '\' under Windows (already fixed in portability.h)
[gzip.c] removed fix for '/' vs '\' under Windows (already fixed in portability.h)

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs