ClosureUtils: do not export externs/typedefs
diff --git a/compiler-jx/src/main/java/org/apache/royale/compiler/utils/ClosureUtils.java b/compiler-jx/src/main/java/org/apache/royale/compiler/utils/ClosureUtils.java
index e148a2c..0a28046 100644
--- a/compiler-jx/src/main/java/org/apache/royale/compiler/utils/ClosureUtils.java
+++ b/compiler-jx/src/main/java/org/apache/royale/compiler/utils/ClosureUtils.java
@@ -157,6 +157,10 @@
                     }
                     else
                     {
+                        if (project.isExterns(qualifiedName))
+                        {
+                            return;
+                        }
                         symbolsResult.add(qualifiedName);
                         if(parentQName == null)
                         {