PHPC-1002: Test against multiple libmongoc versions on evergreen
PHPC-1002: Test against multiple libmongoc versions on evergreen

jmikola/mongo-php-driver,mongodb-labs/mongo-php-driver-prototype,mongodb/mongo-php-driver,jmikola/mongo-php-driver-prototype,jmikola/mongo-php-driver-prototype,mongodb-labs/mongo-php-driver-prototype,jmikola/mongo-php-driver-prototype,mongodb-labs/mongo-php-driver-prototype,mongodb/mongo-php-driver,mongodb/mongo-php-driver,jmikola/mongo-php-driver-prototype,mongodb/mongo-php-driver,jmikola/mongo-php-driver,jmikola/mongo-php-driver,mongodb-labs/mongo-php-driver-prototype,jmikola/mongo-php-driver-prototype,jmikola/mongo-php-driver,mongodb/mongo-php-driver,jmikola/mongo-php-driver,mongodb-labs/mongo-php-driver-prototype