remove obsolete function __dispatch__ * __dispatch__.cc: Delete * libinterp/corefcn/module.mk: Update. * ov-fcn-handle.cc: Eliminte special case for legacy dispatch. * symtab.h, symtab.cc (symbol_table::fcn_info::dispatch_map_type, symbol_table::fcn_info::dispatch_map_const_iterator, symbol_table::fcn_info::dispatch_map_iterator): Delete typedefs. (symbol_table::fcn_info::fcn_info_rep::dispatch_map): Delete data member. (symbol_table::fcn_info::fcn_info_rep::add_dispatch, symbol_table::fcn_info::fcn_info_rep::clear_dispatch, symbol_table::fcn_info::fcn_info_rep::print_dispatch, symbol_table::fcn_info::fcn_info_rep::help_for_dispatch, symbol_table::fcn_info::fcn_info_rep::get_dispatch): Delete member functions. (symbol_table::fcn_info::add_dispatch, symbol_table::fcn_info::clear_dispatch, symbol_table::fcn_info::print_dispatch, symbol_table::fcn_info::help_for_dispatch, symbol_table::fcn_info::get_dispatch): Delete static member functions.

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