Don't add a dependency to the array if the array already contains it

pdf.js

@@ -4173,9 +4173,12 @@ var PartialEvaluator = (function() {
         fnArray.push("dependency");
         argsArray.push(depList);
         for (var i = 0; i < depList.length; i++) {
+          var dep = depList[i];
+          if (dependency.indexOf(dep) == -1) {
             dependency.push(depList[i]);
           }
         }
+      }
 
       function buildPaintImageXObject(image, inline) {
         var dict = image.dict;