MB-11145: Upgrade to gperftools 2.2

Change-Id: I17176895f157e41de3be7d561e4f7c60ae34fd4a
Reviewed-on: http://review.couchbase.org/37621
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>