Make zlib test portable
Make zlib test portable

Change-Id: Iefb995bf398caed3820430e66b70c23bc10545b0
Reviewed-on: http://review.couchbase.org/31682
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>

dewolfe/couchbase-ruby-client,dewolfe/couchbase-ruby-client