This solves some nasty 5.0 -> current update problems.
Up to 5.0, lots of php-using packages were depending on php-mysql-5.2.
So the dependencies would update to php-mysql-5.2 from current.
BUT the php-using packages are now depending on 5.3 -> internal conflict !
With this change, things work again. After the update, you end up with
php-mysql-5.2 AND php-mysql-5.3, you can then try pkg_delete -a to weed
out "unneeded" php*-5.2
okay sthen@, ajacoutot@