FriendsOfPHP / PHP-CS-Fixer / 9549

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bug #2637 ToolInfo - use static dir check for composer discovery (Slamdunk)

This PR was submitted for the master branch but it was merged into the 2.1 branch instead (closes #2637).

Discussion
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ToolInfo - use static dir check for composer discovery

In a Composer installation `php-cs-fixer` binary is present in
* `vendor/friendsofphp/php-cs-fixer/php-cs-fixer`
* `vendor/bin/php-cs-fixer` (symlink)

but someone may want to re-symlink the symlink in a custom/private bin dir.
If so, the script currently fails to detect whether is installed through composer or not.

This is due to the `$_SERVER['SCRIPT_NAME']` variable, that could vary a lot.
But composer installations can have only 2 result path, so just check them statically.

Commits
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63e0dda ToolInfo: use static dir check for composer discovery

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