Fix: resolve strict NOTICE when userland extends and overrides get() et al

[stuartherbert]

In v2.2.0b1, any user-land class extending Memcached, and then overriding methods such as get(), would receive this strict NOTICE from PHP:

PHP Strict standards:  Declaration of MyMemcached::get() should be compatible with Memcached::get($key, $cache_cb = NULL, $cas_token = NULL, $udf_flags = NULL) in /home/stuart/Devel/php-memcached-dev/included_memcached.php on line 9

I've traced this to a few cases where the first param to ZEND_ARG_INFO was '2'. Changing these to '1' fixes this PHP strict NOTICE.

[mkoppanen]

What sort of signature do you inherit with?

[mkoppanen]

Ok, I can see the problem. 2 means ZEND_SEND_PREFER_REF in this case. This was changed during the time when user flags was added. Let me fire a debugger and try to figure out what's going on. I cannot merge this PR as it seems to be breaking three tests.

[mkoppanen]

Following PHP bug is related to this issue: https://bugs.php.net/bug.php?id=66331

[mkoppanen]

I am going to change this into issue rather than pull request. No clear fix yet.

[mkoppanen]

See #126