toggling use of XIM at runtime

[Dave Love]

PROBLEMS suggests rebuilding Emacs without XIM for use on slow links.
Would someone like to merge the following changes from the CVS
`emacs-unicode' branch as a better solution?  Also make a startup
option that toggles the other obvious things like cursor-blinking and
copying between the selection and the kill ring?

2002-10-05  Dave Love  <address@hidden>

        * xfns.c (x_window, x_window): Use use_xim.

        * xterm.c (use_xim): Initialize.
        (xim_open_dpy, xim_initialize, xim_close_dpy): Use use_xim.
        (x_term_init): Maybe set use_xim.

        * xterm.h (use_xim) [HAVE_X_I18N]: Declare.