Mark pdf filterbitmap images as failure ignored

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

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@@ skipping 7414 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 7619 matching lines @@
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