Update pecl package metadata

Change-Id: I00c449da556b6d4ffa2b8c9e75ccedeff60aed35
Reviewed-on: http://review.couchbase.org/29203
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>