Adjusts MacRoman switch heuristics threshold

src/fonts.js

@@ -1976,9 +1976,9 @@ var Font = (function FontClosure() {
             this.isSymbolicFont = false;
         }
 
-        // heuristics: if removed more than 2 glyphs encoding WinAnsiEncoding
-        // does not set properly
-        if (glyphsRemoved > 2) {
+        // heuristics: if removed more than 10 glyphs encoding WinAnsiEncoding
+        // does not set properly (broken PDFs have about 100 removed glyphs)
+        if (glyphsRemoved > 10) {
           warn('Switching TrueType encoding to MacRomanEncoding for ' +
                this.name + ' font');
           encoding = Encodings.MacRomanEncoding;

test/pdfs/issue1709.pdf.link

@@ -0,0 +1 @@
+http://www.mft-online.de/files/medizinerreport_2012.pdf

test/test_manifest.json

@@ -402,6 +402,14 @@
       "link": true,
       "type": "eq"
     },
+    {  "id": "issue1709",
+      "file": "pdfs/issue1709.pdf",
+      "md5": "84497bd23b7c82d03d2681a1cb1d9ed0",
+      "rounds": 1,
+      "pageLimit": 10,
+      "link": true,
+      "type": "eq"
+    },
     {  "id": "issue1015",
       "file": "pdfs/issue1015.pdf",
       "md5": "b61503d1b445742b665212866afb60e2",