Skip test on PostgreSQL 10

The 42P18 error is not produced by the server anymore.

ext/pdo_pgsql/tests/bug48764.phpt

@@ -12,7 +12,7 @@ $db = PDOTest::factory();
 $client_version = $db->getAttribute(PDO::ATTR_CLIENT_VERSION);
 $server_version = $db->getAttribute(PDO::ATTR_SERVER_VERSION);
 
-if (version_compare($server_version, '7.4', '<') || version_compare($client_version, '7.4', '<')) {
+if (version_compare($server_version, '7.4', '<') || version_compare($client_version, '7.4', '<') || version_compare($server_version, '10', '>=')) {
         die('skip');
 }