Description:
------------
We are getting "segmentation fault" error when trying to use file_get_contents() + stream context with ssh2.sftp wrapper. 
It works with ssh2_connect() + ssh2_sftp() functions, but not with creating the stream context.


PHP: v7.4
ssh2 package: v1.2
Tested with Ubuntu and opensuse OSes, same result.

Test script:
---------------
$options = [
    "ssh2" => [
        "username" => "user",
        "pubkey_file" => 'path/to/key.pub',
        "privkey_file" => 'path/to/key'
    ]
];
$context = stream_context_create($options, []);
file_get_contents('ssh2.sftp://domain.com/path/to/file', false, $context);


Expected result:
----------------
File content

Actual result:
--------------
segmentation fault error