Prototypes wrong for XRegisterIMInstantiateCallback and XUnregisterIMInstantiateCallback

[Jeff Johnson]

Right from the very first 1.0 LSB version, the prototypes for these two
functions (defined in X11/Xlib.h) appear to have incorporated a typo for the
fifth parameter. The LSB version of the prototype is (only one shown, but both
are analogous):

extern Bool XRegisterIMInstantiateCallback(
    Display* /* dpy */,
    struct _XrmHashBucketRec* /* rdb */,
    char* /* res_name */,
    char* /* res_class */,
    XIDProc /* callback */,
    XPointer /* client_data */
);