* PHP-8.3:
  Fix GH-19998: ext/standard/tests/file/bug46347.phpt sometimes fails: racy in parallel

* PHP-8.4:
  Fix GH-19998: ext/standard/tests/file/bug46347.phpt sometimes fails: racy in parallel

* PHP-8.5:
  Fix GH-19998: ext/standard/tests/file/bug46347.phpt sometimes fails: racy in parallel

Closes GH-20007.

* PHP-8.5:
  Fix GH-20006: Power of 0 of BcMath number causes UB

…s as parameter

In the past, when libmysqlclient could be used, it accepted ipv6 addresses
as hostname without enclosing it first in brackets. However, in mysqlnd
this never worked. In the past this caused a discrepancy between the two
implementations.
Nowadays, mysqli only works with mysqlnd so we don't even have to cater
to libmysqlclient. However, a plain ipv6 address should still work as a
hostname. Also for people migrating to newer PHP versions it's nice if
this keeps working.

The solution is to check if we're dealing with an ipv6 address not yet
enclosed in brackets. In that case we add the brackets automatically.

Closes GH-19750.

* PHP-8.3:
  Fix bug #67563: mysqli compiled with mysqlnd does not take ipv6 adress as parameter

* PHP-8.4:
  Fix bug #67563: mysqli compiled with mysqlnd does not take ipv6 adress as parameter

* PHP-8.5:
  Fix bug #67563: mysqli compiled with mysqlnd does not take ipv6 adress as parameter

* PHP-8.3:
  Fix NEWS formatting

* PHP-8.4:
  Fix NEWS formatting

* PHP-8.5:
  Fix NEWS formatting

The call_user_function() API redoes the zend_is_callable() check, which has been just done.

We can check validity and retrieve the FCC to call it directly rather than having a useless double check