add get screen size

git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@825 b9cfdab3-6d41-4d17-bbe4-086880011989

src/backend/call.c

@@ -54,6 +54,7 @@
 		MwLLGetClipboard = MwLLGetClipboardImpl; \
 \
 		MwLLGetCursorCoord = MwLLGetCursorCoordImpl; \
+		MwLLGetScreenSize  = MwLLGetScreenSizeImpl; \
 \
 		return 0; \
 	}