eliminate WHO arguments from interpreter-private functions * interpreter-private.h, inpterpreter-private.cc (__get_interpreter__, __get_dynamic_loader__, __get_error_system__, __get_gh_manager__, __get_help_system__, __get_input_system__, __get_load_path__, __get_load_save_system__, __get_event_manager__, __get_output_system__, __get_type_info__, __get_symbol_table__, __get_current_scope__, __require_current_scope__, __get_evaluator__, __get_bp_table__, __get_child_list__, __get_cdef_manager__, __get_display_info__, __get_gtk_manager__): Eliminate WHO argument. Previously, it was never displayed by __get_interpreter__. And, as pointed out by Petter Tomner in patch #10216, passing a std::string object could have performance issues. (__get_interpreter__): Eliminate useless call to error. Display message to std::cerr then abort.

--- a/libinterp/octave-value/ov-mex-fcn.cc	Tue Jun 21 15:44:03 2022 +0200
+++ b/libinterp/octave-value/ov-mex-fcn.cc	Wed Jun 22 12:48:59 2022 -0400
@@ -73,8 +73,7 @@
   if (m_exit_fcn_ptr)
     (*m_exit_fcn_ptr) ();
 
-  octave::dynamic_loader& dyn_loader
-    = octave::__get_dynamic_loader__ ("~octave_mex_function");
+  octave::dynamic_loader& dyn_loader = octave::__get_dynamic_loader__ ();
 
   dyn_loader.remove_mex (m_name, m_sh_lib);
 }