Fix invalid XUID entries in CFF fonts

In CFF fonts, entry `XUID` should be an array that has no more than
16 elements. In the issue, the length is 20, which causes the fonts to fail.
See Appendix B, "Implementation Limits" in PostScript Language Reference Manual
https://web.archive.org/web/20170218093716/https://www.adobe.com/products/postscript/pdfs/PLRM.pdf
Actually entries `XUID` and `UniqueID` are obsolete altogether.
https://blogs.adobe.com/CCJKType/2016/06/no-more-xuid-arrays.html

src/core/cff_parser.js

@@ -1407,6 +1407,12 @@ class CFFCompiler {
       }
     }
 
+    const xuid = cff.topDict.getByName("XUID");
+    if (xuid && xuid.length > 16) {
+      // Length of XUID array must not be greater than 16 (issue #12399).
+      cff.topDict.removeByName("XUID");
+    }
+
     cff.topDict.setByName("charset", 0);
     var compiled = this.compileTopDicts(
       [cff.topDict],

test/pdfs/.gitignore

@@ -169,6 +169,7 @@
 !issue5202.pdf
 !images_1bit_grayscale.pdf
 !issue5280.pdf
+!issue12399_reduced.pdf
 !issue5677.pdf
 !issue5954.pdf
 !issue6612.pdf

test/test_manifest.json

@@ -1914,6 +1914,12 @@
        "type": "eq",
        "about": "Please note that this file currently renders incorrectly."
     },
+    {  "id": "issue12399",
+       "file": "pdfs/issue12399_reduced.pdf",
+       "md5": "01bdd258be93e10f8399708eecedbfd6",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue5808-text",
        "file": "pdfs/issue5808.pdf",
        "md5": "e0584dd540d7859d6c191aa53379692e",