Description:
------------
When I attempt to use `\FFI::scope()` in CLI scripts (no preloading and all that jazz), I get an error saying

    PHP Fatal error:  Uncaught FFI\Exception: Failed loading scope 'FOO' in ...

The stack trace reveals no reasons. I would presume scopes are OK to be used in CLI SAPI, or then there is some documentation missing as to why it is not possible.

Test script:
---------------
<?php declare(strict_types = 1);

$header = <<<'HEA'
    #define FFI_SCOPE "FOO"
    #define FFI_LIB "libc.so.6"

    void printf(char *const str, ...);
    'HEA';

file_put_contents(__DIR__ . '/header.h', $header);

\FFI::load(__DIR__ . '/header.h');

$ffi = \FFI::scope('FOO');

$ffi->printf('Hello %s!', 'world');

Expected result:
----------------
Output should be

    Hello world!

Actual result:
--------------
Output is

    PHP Fatal error:  Uncaught FFI\Exception: Failed loading scope 'FOO' in .../hello-world.php:14
    Stack trace:
    #0 .../hello-world.php(14): FFI::scope()
    #1 {main}
      thrown in .../hello-world.php on line 14