Add a --localize-hidden option to objcopy

[Nick Clifton]

Hi Richard,

   I agree that a separate switch is a better approach.

> binutils/
> 	* objcopy.c (localize_hidden): New variable.
> 	(OPTION_LOCALIZE_HIDDEN): New command_line_switch value.
> 	(copy_options): Add --localize-hidden.
> 	(copy_usage): Mention --localize-hidden.
> 	(is_hidden_symbol): New function.
> 	(filter_symbols): Handle localize_hidden.
> 	(copy_object): Call filter_symbols if localize_hidden.
> 	(copy_main): Handle OPTION_LOCALIZE_HIDDEN.
> 	* doc/binutils.texi (--localize-hidden): Document new option.
> 
> binutils/testsuite/
> 	* binutils-all/localize-hidden-1.s,
> 	* binutils-all/localize-hidden-1.d,
> 	* binutils-all/localize-hidden-2.s,
> 	* binutils-all/localize-hidden-2.d: New tests.
> 	* binutils-all/objcopy.exp: Run them.

Approved - please apply.

Cheers
   Nick