Add support for the nativeImageDecoderSupport parameter, to force JPEG image decoding using src/core/jpg.js, when running the reference tests

test/driver.js

@@ -358,6 +358,7 @@ var Driver = (function DriverClosure() { // eslint-disable-line no-unused-vars
           PDFJS.getDocument({
             url: absoluteUrl,
             password: task.password,
+            nativeImageDecoderSupport: task.nativeImageDecoderSupport,
           }).then((doc) => {
             task.pdfDoc = doc;
             this._nextPage(task, failure);

test/test_manifest.json

@@ -3378,6 +3378,15 @@
        "link": true,
        "type": "eq"
     },
+    {  "id": "issue4926-built-in-jpg",
+       "file": "pdfs/issue4926.pdf",
+       "md5": "ed881c8ea2f9bc4be94ecb7f2b2c149b",
+       "rounds": 1,
+       "link": true,
+       "lastPage": 1,
+       "type": "eq",
+       "nativeImageDecoderSupport": "none"
+    },
     {  "id": "issue5592",
        "file": "pdfs/issue5592.pdf",
        "md5": "a0750f95afa80c880f7966df7062616c",