Generate static accessors fro protected functions in different packages

#KT-4617 Fixed

compiler/testData/codegen/boxMultiFile/accessorForProtected/3.kt

@@ -0,0 +1,12 @@
+package b
+
+import a.A
+
+class B: A() {
+    fun test(): String {
+        val a = {
+            protectedFun()
+        }
+        return a()
+    }
+}