Remove SIZEOF_OFF_T undef in PDO PGSQL driver (#8301)

This has been introduced as part of fixing https://bugs.php.net/79532 (67f9b0b) because ``pg_config.h`` was included.

As this is no longer the case we don't need this undef any more.

Author: Girgias

ext/pdo_pgsql/pgsql_driver.c

@@ -29,7 +29,6 @@
 #include "pdo/php_pdo_driver.h"
 #include "pdo/php_pdo_error.h"
 #include "ext/standard/file.h"
-#undef SIZEOF_OFF_T
 #include "php_pdo_pgsql.h"
 #include "php_pdo_pgsql_int.h"
 #include "zend_exceptions.h"