Backport from trunk.

Backport from trunk.
* xfns.c (create_frame_xic): Pass XNStatusAttributes to XCreateIC
only if xic_style calls for it.  This change allows Emacs to work
with ibus.  Also, don't leak resources if create_frame_xic fails,
and stop caching xic_style across different displays.
(supported_xim_styles): Make const.
(best_xim_style): Remove first parameter: it's always just
supported_xim_styles.  Change to look at supported_xim_styles
directly.