* objcopy.c (change_leading_char): New static variable.

	* objcopy.c (change_leading_char): New static variable.
	(OPTION_CHANGE_LEADING_CHAR): Define.
	(copy_options): Add "change-leading-char".
	(copy_usage): Mention --change-leading-char.
	(filter_symbols): Add obfd parameter.  Change all callers.
	Implement change_leading_char.
	(copy_object): Call filter_symbols if change_leading_char.
	(copy_main): Handle OPTION_CHANGE_LEADING_CHAR.
	* binutils.texi, objcopy.1: Document --change-leading-char.