bug#4671: `read-passwd' does not recognize keypad enter key

[Michael Ernst]

My Kinesis keyboard's "enter" key is read by Emacs as kp-enter.  As a
result, the enter key does not terminate a password as read by
`read-passwd'.  This patch corrects that problem.

                    -Michael Ernst

Changelog entry:

2009-10-08  Michael Ernst  <mernst@alum.mit.edu>

        * subr.el (read-passwd): Add 'kp-enter to stop-keys.


--- /homes/gws/mernst/bin/src/emacs-22/Linux-i686/emacs/lisp/subr.el    
2009-10-01 10:47:42.000000000 -0700
+++ -   2009-10-07 22:31:51.839795567 -0700
@@ -1940,7 +1940,7 @@
            (echo-keystrokes 0)
            (cursor-in-echo-area t)
            (message-log-max nil)
-           (stop-keys (list 'return ?\r ?\n ?\e))
+           (stop-keys (list 'return ?\r ?\n ?\e 'kp-enter))
            (rubout-keys (list 'backspace ?\b ?\177)))
        (add-text-properties 0 (length prompt)
                             minibuffer-prompt-properties prompt)