Use fuzzy comparison for stroke join determination.

This sometimes produces something just slightly different from 0
compared to x86(_64).

Author: QuLogic

extern/agg24-svn/include/agg_math_stroke.h

@@ -391,7 +391,8 @@ namespace agg
         vc.remove_all();
 
         double cp = cross_product(v0.x, v0.y, v1.x, v1.y, v2.x, v2.y);
-        if(cp != 0 && (cp > 0) == (m_width > 0))
+        if ((cp > agg::vertex_dist_epsilon && m_width > 0) ||
+            (cp < -agg::vertex_dist_epsilon && m_width < 0))
         {
             // Inner join
             //---------------

lib/matplotlib/tests/baseline_images/test_pickle/multi_pickle.png

@@ -34,8 +34,7 @@ def test_startpoints():
     plt.plot(start_x, start_y, 'ok')
 
 
-@image_comparison(baseline_images=['streamplot_colormap'],
-                  tol=0.002)
+@image_comparison(baseline_images=['streamplot_colormap'])
 def test_colormap():
     X, Y, U, V = velocity_field()
     plt.streamplot(X, Y, U, V, color=U, density=0.6, linewidth=2,