replace arcto quads with a conic

src/core/SkGeometry.cpp

Index: src/core/SkGeometry.cpp
diff --git a/src/core/SkGeometry.cpp b/src/core/SkGeometry.cpp
index 2ea3095198b4998d153e1f6ccade2c3ae1102446..04e396c37741d8d13d5a925e36ef0f42bb988c88 100644
--- a/src/core/SkGeometry.cpp
+++ b/src/core/SkGeometry.cpp
@@ -951,6 +951,7 @@ bool SkChopMonoCubicAtX(SkPoint src[4], SkScalar x, SkPoint dst[7]) {
 
 ///////////////////////////////////////////////////////////////////////////////
 
+#ifdef SK_SUPPORT_LEGACY_ARCTO
 /*  Find t value for quadratic [a, b, c] = d.
     Return 0 if there is no solution within [0, 1)
 */
@@ -1120,7 +1121,7 @@ int SkBuildQuadArc(const SkVector& uStart, const SkVector& uStop,
     matrix.mapPoints(quadPoints, pointCount);
     return pointCount;
 }
-
+#endif
 
 ///////////////////////////////////////////////////////////////////////////////
 //