fix linux point compare

src/pathops/SkPathOpsPoint.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpsPoint_DEFINED
 #define SkPathOpsPoint_DEFINED
 
 #include "SkPathOpsTypes.h"
@@ skipping 84 matching lines @@
         fX -= v.fX;
         fY -= v.fY;
     }
 
     // note: this can not be implemented with
     // return approximately_equal(a.fY, fY) && approximately_equal(a.fX, fX);
     // because that will not take the magnitude of the values
     bool approximatelyEqual(const SkDPoint& a) const {
         double denom = SkTMax(fabs(fX), SkTMax(fabs(fY),
                 SkTMax(fabs(a.fX), fabs(a.fY))));
-        if (denom == 0) {
+        if (precisely_zero(denom)) {
             return true;
         }
         double inv = 1 / denom;
         return approximately_equal(fX * inv, a.fX * inv)
                 && approximately_equal(fY * inv, a.fY * inv);
     }
 
     bool approximatelyEqual(const SkPoint& a) const {
         return AlmostEqualUlps(SkDoubleToScalar(fX), a.fX)
                 && AlmostEqualUlps(SkDoubleToScalar(fY), a.fY);
@@ skipping 39 matching lines @@
     double moreRoughlyEqual(const SkDPoint& a) const {
         return more_roughly_equal(a.fY, fY) && more_roughly_equal(a.fX, fX);
     }
 
     double roughlyEqual(const SkDPoint& a) const {
         return roughly_equal(a.fY, fY) && roughly_equal(a.fX, fX);
     }
 };
 
 #endif