fix deprecated CLOB type declaration in SQL Server platform

lib/Doctrine/DBAL/Platforms/SQLServerPlatform.php

@@ -1034,7 +1034,7 @@ class SQLServerPlatform extends AbstractPlatform
      */
     public function getClobTypeDeclarationSQL(array $field)
     {
-        return 'TEXT';
+        return 'VARCHAR(MAX)';
     }
 
     /**

tests/Doctrine/Tests/DBAL/Platforms/SQLServerPlatformTest.php

@@ -126,6 +126,11 @@ class SQLServerPlatformTest extends AbstractPlatformTestCase
                 $this->_platform->getVarcharTypeDeclarationSQL(array()),
                 'Long string declaration is not correct'
         );
+        $this->assertSame('VARCHAR(MAX)', $this->_platform->getClobTypeDeclarationSQL(array()));
+        $this->assertSame(
+            'VARCHAR(MAX)',
+            $this->_platform->getClobTypeDeclarationSQL(array('length' => 5, 'fixed' => true))
+        );
     }
 
     public function testPrefersIdentityColumns()