Description:
------------
When PHP is compiled using the option --disable-session, it won't be able to load memcache.so extension.

I try to compile PHP for CLI only therefore I choose to disable the session of PHP and memcache extension for PHP. I have no problem to compile but I have a startup error while loading memcache extension : PHP Warning:  PHP Startup: Unable to load dynamic library '/home/mazzu/php/test/memcache.so - /home/mazzu/php/test/memcache.so: undefined symbol: php_session_create_id in Unknown on line 0'.

Enable session makes this problem disappear.

Reproduce code:
---------------
PHP configure :
./configure --disable-session

Memcache configure :
./configure --enable-memcache --disable-memcache-session --with-php-config=/usr/bin/php-config

php-cli.ini :
extension_dir=/home/mazzu/php/test/
extension=memcache.so

hello.php :
<?php echo "Hello World"; ?>

command line :
mazzu@linux1:~/php/test$ /usr/bin/php -c ./php-cli.ini hello.php

Expected result:
----------------
Hello World

Actual result:
--------------
PHP Warning:  PHP Startup: Unable to load dynamic library '/home/mazzu/php/test/memcache.so' - /home/mazzu/php/test/memcache.so: undefined symbol: php_session_create_id in Unknown on line 0
Hello World