Fixes clang build issues

FL/Fl_Widget.H

@@ -110,6 +110,7 @@ struct FL_EXPORT Fl_Label {
  */
 class FL_EXPORT Fl_Widget {
   friend class Fl_Group;
+  friend class Fl_X;
 
   Fl_Group* parent_;
   Fl_Callback* callback_;

fluid/Fl_Type.h

@@ -45,7 +45,6 @@ void set_modflag(int mf);
 class Fl_Type {
 
   friend class Widget_Browser;
-  friend Fl_Widget *make_type_browser(int,int,int,int,const char *l=0);
   friend class Fl_Window_Type;
   virtual void setlabel(const char *); // virtual part of label(char*)