Zend OPcache API is restricted by "restrict_api" configuration directive

PHP Startup: Unable to load dynamic library '/usr/local/php56/lib/php/extensions/no-debug-non-zts-20131226/mcrypt.so' - /usr/local/php56/lib/php/extensions/no-debug-non-zts-20131226/mcrypt.so: cannot open shared object file: No such file or directory