Wintab32 (Patch 3 of 8) -- Expose more XInput events through the wintab api.

[Robert North]

This set of patches works towards better quality painting in Painter5.
Tested on Painter5 & Photoshop 6.

Changelog:
	* Correct overflow 1 message too early.
	* Overflow now going onto message queue.
	* Overflow state correctly or-ed with other packet status.

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Index: dlls/wintab32/context.c
===================================================================
--- dlls/wintab32/context.c	(revision 155)
+++ dlls/wintab32/context.c	(revision 156)
@@ -203,10 +203,10 @@
 
             DUMPPACKET(*packet);
 
-            if (tgt + 1 == ptr->QueueSize)
+            if (tgt == ptr->QueueSize)
             {
                 TRACE("Queue Overflow %p\n",ptr->handle);
-                packet->pkStatus = TPS_QUEUE_ERR;
+                ptr->PacketQueue[tgt-1].pkStatus |= TPS_QUEUE_ERR;
             }
             else
             {