gdiplus: Add a stub for GdipSetEffectParameters.
diff --git a/include/gdiplusgpstubs.h b/include/gdiplusgpstubs.h
index cba15e4..d7d8702 100644
--- a/include/gdiplusgpstubs.h
+++ b/include/gdiplusgpstubs.h
@@ -39,6 +39,7 @@
 class GpFont {};
 class GpStringFormat {};
 class GpRegion {};
+class CGpEffect {};
 
 #else /* end of c++ declarations */
 
@@ -60,6 +61,7 @@
 typedef struct GpFont GpFont;
 typedef struct GpStringFormat GpStringFormat;
 typedef struct GpRegion GpRegion;
+typedef struct CGpEffect CGpEffect;
 
 #endif /* end of c declarations */