Force newer snappy version used by Kafka

This fixes all problems seen with
https://github.com/xerial/snappy-java/issues/17 on e.g. CentOS 5 by
replacing the included library version 1.0.5 with the latest version
as suggested by xerial.

This is proposed to go into Kafka proper, see
https://issues.apache.org/jira/browse/KAFKA-1369