Test `posix_kill_pidoverflow` depends on `pcntl` but not skipped if it's disabled

[fuhsnn]

Description

The said test uses SIGTERM:

php-src/ext/posix/tests/posix_kill_pidoverflow.phpt

Lines 10 to 14 in 5b3d0e4

	try {
	posix_kill(PHP_INT_MAX, SIGTERM);
	} catch (\ValueError $e) {
	echo $e->getMessage(), PHP_EOL;
	}

which I believe is only a predefined constant if pcntl module is built.

The context is ./configure doesn't know slimcc, the C compiler I work on, so pcntl wasn't enabled by default, and the test failed with Fatal error: Uncaught Error: Undefined constant "SIGTERM" before reaching the expected exception.
I re-configured PHP with --enable-pcntl and the pass passed.

PHP Version

PHP 8.5.0alpha4 (cli)

Operating System

Debian 12 x86-64

[devnexen]

Hi @fuhsnn looking into it :)