unzip concatenated gzip files

[Loïc Grenié]

   This patch tries to allow the unzipping of concatenated gzip files.
  Test:

% echo First > first
% gzip first
% echo Second > second
% gzip second
% cat first.gz second.gz > total.gz
% ./busybox gunzip total.gz
% cat total
First
Second
%

    If there are no errors, this should address Debian's bug
#402482<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=402482>
.
  The feature costs 400 bytes on i386. I've removed a couple of
  initializations that (look) useless (to me). I've also added a feature
  for message "decompression OK, trailing garbage ignored".

       Loïc
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