dix: move ProcGrabPointer guts into GrabDevice.

Yes, this means we have even more arguments to GrabDevice. But it beats having
a copy of most but not all of GrabDevice in ProcGrabPointer.
Also, reshuffle the order of parameters, the CARD* status is a return value
and should be last.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

include/dix.h

@@ -434,8 +434,10 @@ extern _X_EXPORT int GrabDevice(
     unsigned /* ownerEvents */,
     Time /* ctime */,
     Mask /* mask */,
-    CARD8 * /* status */,
-    Bool /* coreGrab */);
+    Bool /* coreGrab */,
+    Cursor /* curs */,
+    Window /* confineToWin */,
+    CARD8 * /* status */);
 
 extern _X_EXPORT void InitEvents(void);