Fix #80774: session_name() problem with backslash

Since we do no longer URL decode cookie names[1], we must not URL
encode the session name. We need to prevent broken Set-Cookie headers

Fix #80774: session_name() problem with backslash

Since we do no longer URL decode cookie names[1], we must not URL
encode the session name. We need to prevent broken Set-Cookie headers,
by rejecting names which contain invalid characters.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=6559fe912661ca5ce5f0eeeb591d928451428ed0>

Closes GH-6711.

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