FTP/PemFTP Library: Fix some PHP notices.

ftp_base::glob() used each(), which is deprecated as of PHP 7.2.
ftp_base::fget() was missing the decleration of its third parameter, $rest.

Props itowhid06, pento.
Merges [43848] to trunk.
Fixes #44489.

Built from https://develop.svn.wordpress.org/trunk@44184


git-svn-id: https://core.svn.wordpress.org/trunk@44014 1a063a9b-81f0-0310-95a4-ce76da25c4cd