Fix #80266: parse_url silently drops port number 0

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.

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