print cached error messages using _bfd_error_handler

	* bfd.c (bfd_print_error): Make static.  Don't print program name.
	(error_handler_fprintf): Print program name here.
	* format.c (print_warnmsg): Use _bfd_error_handler to print
	cached messages.
	* bfd-in2.h: Regenerate.
3 files changed