Description:
------------
It appears that you guys do not support --enable-memcache anymore. Well, how am I supposed to get the memcache PECL extension to work now? The documentation at php.net/memcache still says this is the correct way to do it. Please fix this.

Reproduce code:
---------------
./configure --with-mysql=/usr --with-mysqli=/usr/bin/mysql_config --with-gd=/usr --enable-gd-native-ttf --with-ttf --with-freetype-dir=/usr/lib --with-apxs2=/usr/local/apache2/bin/apxs --with-mssql=/usr/local/freetds --enable-memcache --enable-pdo=shared --with-pdo-mysql=shared,/usr --with-sqlite=shared --with-pdo-sqlite=shared

Expected result:
----------------
I expected --enable-memcache to work properly.

Actual result:
--------------
Thank you for using PHP.

Notice: Following unknown configure options were used:

--enable-memcache

Check './configure --help' for available options