fix bug #48724

PDO's getColumnMeta() doesn't return native_type for BIT, TINYINT and YEAR
Tests: PDO Mysql - update for fixed getColumnMeta()

The test has always been disabled... so it's never run anyway. Oh well.
Merge pull request #1 from iFixit/pdo-mysql-meta-type-fix

Make PDO getColumnMeta() consistent

Fix PHP bug #48724

Make PDO's getColumnMeta() return native_type for BIT, TINYINT and
YEAR. Previously it was returning null.