Add a reduced test-case for issue 4909

I *should* have included this is PR 4910, but for some reason I didn't so better late than never.

test/pdfs/.gitignore

@@ -23,6 +23,7 @@
 !sizes.pdf
 !close-path-bug.pdf
 !issue4630.pdf
+!issue4909.pdf
 !issue5202.pdf
 !issue5280.pdf
 !issue5954.pdf

test/test_manifest.json

@@ -458,6 +458,13 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue4909",
+       "file": "pdfs/issue4909.pdf",
+       "md5": "ecd62637532aa8383837ef11d72a96b9",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "fit11-talk",
        "file": "pdfs/fit11-talk.pdf",
        "md5": "eb7b224107205db4fea9f7df0185f77d",