* objcopy.c (parse_flags): Make flag check case insensitive.

	* objcopy.c (parse_flags): Make flag check case insensitive.
	Check for `contents' flag.  Give an error for unrecognized flags.
	(copy_section): If the contents flag was set for a section that
	had no contents, zero out the new contents.
	* binutils.texi (objcopy): Document contents section flag.
PR 10601.