PATCH: Bind B-backspace in XEmacs

[Michael Sperber]

Here's another little patch for XEmacs, intent hopefully clear. It'd
be great if somebody could push this!

[Katsumi Yamaoka]

Post by Michael Sperber
Here's another little patch for XEmacs, intent hopefully clear. It'd
be great if somebody could push this!

[...]

Post by Michael Sperber
+
+ * gnus-sum.el (gnus-summary-backend-map): Bind B-backspace to
+ `gnus-summary-delete-article` in a way that also works on XEmacs.
+

Committed (Gnus and Emacs trunks). Thanks!