Description:
------------
Trying to set the value for an 'unknown' ini setting through the FPM config file for a pool causes the pool to segfault.  e.g. when APC isn't loaded the presence of this line: 

php_admin_value[apc.shm_size] = "64M"

in a pool config file loaded automatically from /etc/php-fpm.d/

As PHP-FPM doesn't handle pools crashing on startup particularly well, and doesn't give a visible error message, this can be seen more easily by setting `daemonize = no` in /etc/php-fpm.conf

This does not crash on PHP5.6

Test script:
---------------
N/A

Expected result:
----------------
Unrecognized ini settings have no effect. 

Actual result:
--------------
PHP-FPM fails to start properly, and spams the log file with useless information.