databases/pecl-memcached: Use upstream commit
Obtained from: https://github.com/php-memcached-dev/php-memcached/commit/bb83855d1874d1741ec51277f2ed496a476d35ff
https://github.com/php-memcached-dev/php-memcached/commit/de7d53d13aecd329f03eab2eaf51c1ad8fa5c18f