php: Enable mysqlnd as default
php: Enable mysqlnd as default

MySQL Native Driver was implemented by PHP back in 5.3.0 and has been
default in most distributions for a very long time.

The option was added in 41cd4f2459d63c5ad19a227c3dd5d7704df6161c and I
don't see any reason why it would default to false.

Overview of mysqlnd by PHP: https://secure.php.net/manual/en/mysqlnd.overview.php

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