Description:
------------
It is not possible to call `PDO#getAttribute()` with platform-specific attributes.

Reference: https://travis-ci.org/doctrine/dbal/jobs/40271810#L210
Related: https://bugs.php.net/bug.php?id=38182

Test script:
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<?php

$pdo = new PDO('pgsql:host=localhost port=5432');

$pdo->setAttribute(PDO::PGSQL_ATTR_DISABLE_PREPARES, true);

var_dump($pdo->getAttribute(PDO::PGSQL_ATTR_DISABLE_PREPARES));

Expected result:
----------------
bool(true)

Actual result:
--------------
Fatal error: Uncaught exception 'PDOException' with message 'PDOException: SQLSTATE[IM001]: Driver does not support this function: driver does not support that attribute'