smtpmail support of unicode passwords

[Garreau\, Alexandre]

Hello, smtpmail fails to send mails when the SMTP user password contain
utf8 chars, since it seems base64-encode-string doesn’t support
multibyte encoding, it prevented me to start using Gnus for some months
before I understood what was happening.

Here’s attached the patch.

diff -Naur emacs-old/lisp/mail/smtpmail.el emacs/lisp/mail/smtpmail.el
--- emacs-old/lisp/mail/smtpmail.el     2014-04-13 18:08:54.210814676 +0000
+++ emacs/lisp/mail/smtpmail.el 2014-04-13 18:06:07.502802860 +0000
@@ -580,7 +580,7 @@
       (smtpmail-command-or-throw
        process
        (concat "AUTH PLAIN "
-              (base64-encode-string (concat "\0" user "\0" password) t))
+              (base64-encode-string (string-as-unibyte (concat "\0" user "\0" 
password)) t))
        235))
      (t
       (error "Mechanism %s not implemented" mech)))))

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