[NF] Fix package constant detection.

Belonging to [master]:
  - #2567

Author: perost

Compiler/NFFrontEnd/NFComponentRef.mo

@@ -677,7 +677,7 @@ public
     output Boolean isPkgConst;
   algorithm
     isPkgConst := match cref
-      case CREF(node = InstNode.CLASS_NODE(nodeType = InstNodeType.NORMAL_CLASS())) then true;
+      case CREF(node = InstNode.CLASS_NODE()) then InstNode.isUserdefinedClass(cref.node);
       case CREF(origin = Origin.CREF) then isPackageConstant(cref.restCref);
       else false;
     end match;

Compiler/NFFrontEnd/NFInstNode.mo

@@ -331,6 +331,22 @@ uniontype InstNode
     end match;
   end isBaseClass;
 
+  function isUserdefinedClass
+    input InstNode node;
+    output Boolean isUserdefined;
+  algorithm
+    isUserdefined := match node
+      case CLASS_NODE()
+        then match node.nodeType
+          case InstNodeType.NORMAL_CLASS() then true;
+          case InstNodeType.BASE_CLASS() then true;
+          case InstNodeType.DERIVED_CLASS() then true;
+          else false;
+        end match;
+      else false;
+    end match;
+  end isUserdefinedClass;
+
   function isComponent
     input InstNode node;
     output Boolean isComponent;