Update emacs-snapshot to 24.0.91.20111121.

Changes:
        * mail/rmail.el (rmail-search-message, rmail-forward, rmail-resend):
        Before using mime functions, check they are set.  (Bug#10077)
        * progmodes/sh-script.el (sh-assignment-regexp): Add entry for
        bash.
        * language/european.el (macintosh): Define as alias for mac-roman.

(minskim)