Description:
------------
When trying to connect to a MySQL Compatible Aurora RDS using MYSQLI_CLIENT_COMPRESS PHP just gets stuck on the first query set to the server, be that a set_charset method or an actual query,

According to AWS Staff Wire Compression used in Aurora MySQL Compatible should work with any MySQL Client supporting it (https://forums.aws.amazon.com/thread.jspa?messageID=850833#850833), as PHP's MySQLi System is supposed to support it this should work.


This may be a regression from https://bugs.php.net/bug.php?id=47017

Test script:
---------------
$mysqli = new mysqli();
$mysqli->real_connect('hostname', "username", "password", "alexandria", 3306, '', MYSQLI_CLIENT_COMPRESS);
if(!$mysqli){
    die("unable to connect to DB");
}
$mysqli->set_charset("utf8mb3");

Expected result:
----------------
PHP to use the compressed connection correctly and not just Freeze, 

Actual result:
--------------
in the test script, the die code is not executed meaning that PHP thinks it connected correctly, but then the set_charset call will just freeze even past the 30-second default timeout.