New J2K: add multi-file conversion tests from old j2k

nj2k/testData/multiFile/ProtectedVisibility/InheritorOtherPackage2.java

@@ -0,0 +1,11 @@
+package test2;
+
+import test.*;
+
+public class DerivedOtherPackage extends BaseOtherPackage {
+    protected DerivedOtherPackage() {
+        super();
+        foo();
+        int i = this.i;
+    }
+}