Attempt to improve non-embedded Wingdings font support (bug 1652224)

Now that font-substitution has been implemented, we should be able to do much a better job at supporting non-embedded Wingdings fonts.
Given that this is a Windows-specific font, see https://en.wikipedia.org/wiki/Wingdings, this is however not guaranteed to work (well) on other platforms.

test/pdfs/bug1652224.pdf.link

@@ -0,0 +1 @@
+https://bugzilla.mozilla.org/attachment.cgi?id=9167775

test/pdfs/issue11451.pdf.link

@@ -0,0 +1 @@
+https://github.com/mozilla/pdf.js/files/4003700/error2.pdf

test/test_manifest.json

@@ -3442,6 +3442,23 @@
        "rounds": 1,
        "type": "text"
     },
+    {  "id": "issue11451",
+       "file": "pdfs/issue11451.pdf",
+       "md5": "a2fd3c4596ad75562df83a2494263802",
+       "rounds": 1,
+       "link": true,
+       "lastPage": 1,
+       "type": "eq"
+    },
+    {  "id": "bug1652224",
+       "file": "pdfs/bug1652224.pdf",
+       "md5": "0e1bb427f32e83dc8f091842f7a11ac4",
+       "rounds": 1,
+       "link": true,
+       "firstPage": 5,
+       "lastPage": 5,
+       "type": "eq"
+    },
     {  "id": "issue8586",
        "file": "pdfs/issue8586.pdf",
        "md5": "16b5230364017d3b0d2d65978eb35816",