Clean up unused imports

lib/Doctrine/DBAL/Driver/IBMDB2/DB2Connection.php

@@ -5,7 +5,6 @@ namespace Doctrine\DBAL\Driver\IBMDB2;
 use Doctrine\DBAL\Driver\Connection;
 use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
 use Doctrine\DBAL\ParameterType;
-use stdClass;
 use const DB2_AUTOCOMMIT_OFF;
 use const DB2_AUTOCOMMIT_ON;
 use function db2_autocommit;

lib/Doctrine/DBAL/Platforms/DrizzlePlatform.php

@@ -2,7 +2,6 @@
 
 namespace Doctrine\DBAL\Platforms;
 
-use Doctrine\DBAL\Schema\ColumnDiff;
 use Doctrine\DBAL\Schema\Identifier;
 use Doctrine\DBAL\Schema\Index;
 use Doctrine\DBAL\Schema\Table;

lib/Doctrine/DBAL/Platforms/MySqlPlatform.php

@@ -2,7 +2,6 @@
 
 namespace Doctrine\DBAL\Platforms;
 
-use Doctrine\DBAL\Schema\ColumnDiff;
 use Doctrine\DBAL\Schema\ForeignKeyConstraint;
 use Doctrine\DBAL\Schema\Identifier;
 use Doctrine\DBAL\Schema\Index;

lib/Doctrine/DBAL/Platforms/OraclePlatform.php

@@ -3,7 +3,6 @@
 namespace Doctrine\DBAL\Platforms;
 
 use Doctrine\DBAL\DBALException;
-use Doctrine\DBAL\Schema\ColumnDiff;
 use Doctrine\DBAL\Schema\ForeignKeyConstraint;
 use Doctrine\DBAL\Schema\Identifier;
 use Doctrine\DBAL\Schema\Index;

lib/Doctrine/DBAL/Tools/Console/Command/ReservedWordsCommand.php

@@ -21,7 +21,6 @@ use Doctrine\DBAL\Platforms\Keywords\SQLServer2005Keywords;
 use Doctrine\DBAL\Platforms\Keywords\SQLServer2008Keywords;
 use Doctrine\DBAL\Platforms\Keywords\SQLServer2012Keywords;
 use Doctrine\DBAL\Platforms\Keywords\SQLServerKeywords;
-use Doctrine\DBAL\Schema\Schema;
 use InvalidArgumentException;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;