In MariaDB-10.4.3 EXPIRE passwords where supported for
MariaDB. This only behaves like MySQL when the system
variable disconnect_on_expired_passwords=1.

MariaDB if there was no password it could not be considered
expired. So the test is adjusted to use actual passwords.
(MariaDB commit a94b20a8e0d9e64eeaabdaaa7a3e03fcdb8a686e)

The error codes produced my MariaDB are different
however still conforming to the SQL specification.

Closes GH-6480.

On x32 sizeof(size_t) != sizeof(zend_long), so we need to be
careful with sign extension here.

Patch by bruno dot premont at restena dot lu.

MySQL removed RENAME DATABASE in 18300001c1dbbfddf9a0adcbaeea68956102bdd0
(Sept 2007, 5.1.23). As this briefest existance is very insignificant lets remove it.

It also breaks when testing against MariaDB.

As the alternate path in this test covers all supported MySQL and MariaDB
versions and a signifant portion of unsupported versions lets keep it simple.

Closes GH-6459.

On stable versions, bring back the TRUE/FALSE defines by defining
_U_DEFINE_TRUE_AND_FALSE.

Closes GH-6397.

As of commit 81b2f3e[1], `parse_url()` accepts URLs with a zero port,
but does not report that port, what is wrong in hindsight.

Since the port number is stored as `unsigned short` there is no way to
distinguish between port zero and no port.  For BC reasons, we thus
introduce `parse_url_ex2()` which accepts an output parameter that
allows that distinction, and use the new function to fix the behavior.

The introduction of `parse_url_ex2()` has been suggested by Nikita.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=81b2f3e5d9fcdffd87a4fcd12bd8c708a97091e1>

Closes GH-6399.

As mentioned on bug #80171. This one is in libtool.m4, might get
lost on libtool updates.

Patch contributed by Alexander Bergmann.

Closes GH-6389.