bug#4623: 23.1.50; rmail changes encoding of characters on save

[Glenn Morris]

Thanks for the test case. I know very little about coding issues, but
if setting coding-system-for-write is the correct fix, I think it
should be done in a manner similar to the following, since saving an
rmail file with just "C-x C-s" should work.

*** rmail.el   6 Oct 2009 06:40:40 -0000  1.554
--- rmail.el   13 Oct 2009 01:17:20 -0000
***************
*** 4176,4181 ****
--- 4176,4182 ----
  (defun rmail-write-region-annotate (start end)
    (when (and (null start) (rmail-buffers-swapped-p))
      (set-buffer rmail-view-buffer)
+     (set (make-local-variable 'coding-system-for-write) 'no-conversion)
      (widen)
      nil))