> merge PHP 5 pdo into HEAD. This source compiles on both PHP 5 and PHP 6.
> If you're poking around in here, please make sure that any changes you make
> compile on both PHP 5 and 6. Thanks!
Same goes for Wez. :) (pecl build broken for pdo drivers)
Enabled PDO and PDO_SQLITE by default.
Fixup PDO header detection so that it searches in the correct order, and
correctly picks up the headers when building from outside of the source
tree.
TODO: make pdo_XXX auto-enable when XXX is enabled. Volunteers welcome.