Mark pdf filterbitmap images as failure ignored

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Release-DirectWrite/expected-results.json

 {
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     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
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@@ skipping 5590 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
           "bitmap-64bitMD5", 
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@@ skipping 13 matching lines @@
           "bitmap-64bitMD5", 
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@@ skipping 13 matching lines @@
           "bitmap-64bitMD5", 
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@@ skipping 13 matching lines @@
           "bitmap-64bitMD5", 
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@@ skipping 5518 matching lines @@
           14157160633878011690
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   }
 }