bug symfony#9938 [Process] Add support SAPI cli-server (peter-gribanov)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes symfony#9938).

Discussion
----------

[Process] Add support SAPI cli-server

As of PHP 5.4.0, the CLI SAPI provides a built-in web server.
```php
PHP_SAPI == 'cli-server'
```
PHP can be used portable without installation on PC. For example, the [assembly](http://windows.php.net/download/) does not require installation in the system on Windows. In this case `PHP_BINARY` contains the path to the PHP executor, and all the other search methods will not return result.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
-------

92d8323 Add support SAPI cli-server

src/Symfony/Component/Process/PhpExecutableFinder.php

@@ -39,7 +39,7 @@ public function find()
         }
 
         // PHP_BINARY return the current sapi executable
-        if (defined('PHP_BINARY') && PHP_BINARY && ('cli' === PHP_SAPI) && is_file(PHP_BINARY)) {
+        if (defined('PHP_BINARY') && PHP_BINARY && in_array(PHP_SAPI, array('cli', 'cli-server')) && is_file(PHP_BINARY)) {
             return PHP_BINARY;
         }