[pull] master from php:master#601
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On AIX, NSIG is def'd as SIGMAX64+1, and SIGMAX64 itself is def'd as
255:
```
$ grep -Rw SIGMAX64 /QOpenSys/usr/include/
/QOpenSys/usr/include/sys/signal.h:#define SIGMAX64 255
/QOpenSys/usr/include/sys/signal.h:#define SIGMAX SIGMAX64
/QOpenSys/usr/include/sys/signal.h:#define NSIG64 (SIGMAX64+1)
```
...this causes an overflow when we set num_signals from the value of
NSIG, per GCC:
```
/rpmbuild/BUILD/php-8.5.3/ext/pcntl/pcntl.c:216:25: warning: large integer implicitly truncated to unsigned type [-Woverflow]
PCNTL_G(num_signals) = NSIG;
^~~~
```
...when we try to use pcntl to i.e. install a signal handler, we get an
error from pcntl:
```
Fatal error: Uncaught ValueError: pcntl_signal(): Argument #1 ($signal) must be less than 0 in phar:///QOpenSys/pkgs/bin/composer/vendor/seld/signal-handler/src/SignalHandler.php:491
```
The easiest way to deal with this silly AIX behaviour is to just promote
the storage size.
* PHP-8.5: Update NEWS for pcntl fix [skip ci] ext/pcntl: Bump num_signals to uint16_t (#21347)
And propagate const qualifier to use sites of this function.
This function is not defined in any headers
The primary motivation for this is that this is required for my abstract generic types proof of concept, as the resolving of bound types needs to happen early to properly track the types. However, there doesn't seem to be a good reason for delaying the inheritance of interfaces. This approach might even allow us to drop the `iface` parameter of the `interface_gets_implemented()` handler as the interface name is always known.
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