Added missing file to package.xml.
Added missing file to package.xml.

Change-Id: I9c64f7f718fdb9059482591b1c15b3ad45736f65
Reviewed-on: http://review.couchbase.org/29337
Reviewed-by: Matt Ingenthron <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@couchbase.com>
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

couchbase/php-ext-couchbase,couchbase/php-ext-couchbase,couchbase/php-ext-couchbase,couchbase/php-ext-couchbase,couchbase/php-ext-couchbase