Mark morphology test as expected-to-fail for poppler.

expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json

Index: expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json
diff --git a/expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json b/expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json
index 6c50acd3d29dd202ae7affd1cbe640e6370cb62e..b4b7106d2a65ddf92c30604106226128e1ca0e57 100644
--- a/expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json
+++ b/expectations/gm/Test-Mac10.6-MacMini4.1-GeForce320M-x86_64-Debug/expected-results.json
@@ -10530,8 +10530,9 @@
         ]
       ], 
       "bugs": [
-        1578
+        1657
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": false
     }, 
     "nested_aa_565.png": {
@@ -14907,4 +14908,4 @@
       "reviewed-by-human": false
     }
   }
-}
+}