RFC: (set-xkb-cyrillic-charset "koi8-r") for non-Mule XEmacs

Salam, there is a very annoying issue when using non-Mule XEmacsen in Cyrillic environments under X with xkb. src/event-Xt.c contains x_keysym_to_character() which translates Cyrillic_XXX to one-byte character code (also used by Mule). Without Mule it always produces iso8859-5 characters, which is very annoying because in fact this charset is very rarely used in Russia. Various horrible hacks float around, e.g.: (global-set-key [(Cyrillic_HARDSIGN)] '(lambda () (interactive) (insert "\xFF"))) and so on for every Cyrillic_XXX. This looks horrible, does not work with isearch and is otherwise unacceptable, though widely used :) Some decide to disable Xkb. Some try to switch to Mule, but get stuck with font encoding problem we've been fixing recently :) I think I'll try to implement (set-xkb-cyrillic-charset "koi8-r") ;; also "iso8859-5" (default), ;; "windows-1251" and "cp866" that switches cyrillic[] array used by that function. I've already got some approval of this idea and encouragement by some local XEmacs users. Hope to have patch available very soon. --alexm