server: Allow setting a zero-size clip rectangle.
diff --git a/server/protocol.def b/server/protocol.def
index 767be04..123f16a 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -3351,6 +3351,7 @@
 #define SET_CURSOR_COUNT  0x02
 #define SET_CURSOR_POS    0x04
 #define SET_CURSOR_CLIP   0x08
+#define SET_CURSOR_NOCLIP 0x10
 
 
 /* Retrieve the suspended context of a thread */