Add support for removing named sections to objcopy and strip.

	Add support for removing named sections to objcopy and strip.
	* objcopy.c (struct section_list): Define.
	(remove_sections): New static variable.
	(strip_options, copy_options): Add remove-section.
	(copy_usage, strip_usage): Mention -R and --remove-section.
	(setup_section): If section is in remove_sections list, ignore it.
	(copy_section): Likewise.
	(strip_main, copy_main): Handle -R.
	* binutils.texi, objcopy.1, strip.1: Document new options.