[php-src] Issue #22536: Compilation error for php-8.5

Issue: https://github.com/php/php-src/issues/22536
Author: thomas-0816

### Description

The following code:

```
git clone --depth=1 --branch=PHP-8.5 https://github.com/php/php-src.git
cd php-src
./buildconf --force
./configure --disable-zts --disable-all --enable-cli --enable-pdo
make -j$(nproc)
```

Resulted in this output:
```
/home/tb/code/pdo-duckdb2/temp/php-src/sapi/cli/php_cli_server.c: In function ‘php_cli_server_worker_install_pdeathsig’:
/home/tb/code/pdo-duckdb2/temp/php-src/sapi/cli/php_cli_server.c:2497:26: error: ‘php_cli_server_master’ undeclared (first use in this function); did you mean ‘php_cli_server_dtor’?
 2497 |         if (getppid() != php_cli_server_master) {
      |                          ^~~~~~~~~~~~~~~~~~~~~
      |                          php_cli_server_dtor
/home/tb/code/pdo-duckdb2/temp/php-src/sapi/cli/php_cli_server.c:2497:26: note: each undeclared identifier is reported only once for each function it appears in
/home/tb/code/pdo-duckdb2/temp/php-src/sapi/cli/php_cli_server.c: At top level:
/home/tb/code/pdo-duckdb2/temp/php-src/sapi/cli/php_cli_server.c:2486:13: warning: ‘php_cli_server_worker_install_pdeathsig’ defined but not used [-Wunused-function]
 2486 | static void php_cli_server_worker_install_pdeathsig(void)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

```

But I expected this output instead:
```
no compilation error
```


we have:

```
/sapi/cli/php_cli_server.c
#ifdef HAVE_FORK
...
static pid_t	 php_cli_server_master;
...

#if defined(HAVE_PRCTL) || defined(HAVE_PROCCTL)
static void php_cli_server_worker_install_pdeathsig(void)
{
...
	if (getppid() != php_cli_server_master) {
```

### PHP Version

```plain
php-8.5
```

### Operating System

Ubuntu 24.04