gdiplus: Added GdipSetPenLineJoin.
diff --git a/include/gdiplusgpstubs.h b/include/gdiplusgpstubs.h
index 5c02268..b3962aa 100644
--- a/include/gdiplusgpstubs.h
+++ b/include/gdiplusgpstubs.h
@@ -47,5 +47,6 @@
 typedef PathData GpPathData;
 typedef LineCap GpLineCap;
 typedef RectF GpRectF;
+typedef LineJoin GpLineJoin;
 
 #endif