NFC:Triangulation - don't add zero-length bridges to avoid list.

src/srf/triangulate.cpp

@@ -210,8 +210,10 @@ haveEdge:
 
     // and future bridges mustn't cross our bridge, and it's tricky to get
     // things right if two bridges come from the same point
+    if(withbridge) {
         avoidEdges->AddEdge(a, b);
         avoidPts->Add(&a);
+    }
     avoidPts->Add(&b);
 
     l.Clear();