Don't add prototypes for functions that don't exist.

Note that a full review was not done, only for functions that receive
char/short arguments, or one of it's parameters is a function pointer
that requires char/short arguments.

src/xlibi18n/XimTrans.h

@@ -84,12 +84,6 @@ extern void _XimFreeTransIntrCallback(
     Xim		 im
 );
 
-extern Bool _XimTransIntrCallbackCheck(
-    Xim		 im,
-    INT16	 len,
-    XPointer	 data
-);
-
 extern Bool _XimTransFilterWaitEvent(
     Display	*d,
     Window	 w,

src/xlibi18n/Ximint.h

@@ -841,14 +841,6 @@ extern Bool	_XimRead(
     XPointer	 arg
 );
 
-extern Bool	_XimIntrCallback(
-    Xim		 im,
-    Bool	 (*callback)(
-			     Xim, INT16, XPointer, XPointer
-			     ),
-    XPointer	 call_data
-);
-
 extern void	_XimFlush(
     Xim		 im
 );