Ignore buggy clip gm on Mac 10.9

expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug/expected-results.json

Index: expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug/expected-results.json
diff --git a/expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug/expected-results.json b/expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug/expected-results.json
index 67e3e07c974b48320d17b6c202679a1896ece7d5..f299549b5acf2f8acd0ff94020124e63c0b97e85 100644
--- a/expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug/expected-results.json
+++ b/expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Debug/expected-results.json
@@ -15518,6 +15518,7 @@
           14852444518787952875
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "simpleaaclip_path_pdf-mac.png": {
@@ -17855,4 +17856,4 @@
       "reviewed-by-human": true
     }
   }
-}
+}