* gnome-settings-xsettings.c: added two new xsettings
for GTK+ input method preedit and status styles.
With the other patch for gtk+, the preedit and status styles of
GTK+ input method are configurable with associated gconf schemas
keys:
"/desktop/gnome/interface/gtk-im-preedit-style"
"/desktop/gnome/interface/gtk-im-status-style"
Both are set to "callback" by default, and platform's
packging can have different default by changing
libgnome's desktop_gnome_interface.schemas.