Add ar --output

[Nick Clifton]

Hi Fangrui,

> I think that the --output option should keep the is_valid_archive_path
> check.

Ok, I will leave that it in.  If users complain in the future then we can
revisit this decision.

> I sent a patch a few days ago:
> https://sourceware.org/ml/binutils/2019-10/msg00193.html (both absolute

Oops, sorry, I missed that.

So I have taken your patch, added a few tweaks of my own, and checked in
the following:

Cheers
  Nick

binutils/ChangeLog
2019-10-30  Fangrui Song  <i@maskray.me>
	    Nick Clifton  <nickc@redhat.com>

	* ar.c (emum long option numbers): Declare.  Use to provide
	numerical values for long options.
	(long_options): Add --output option.
	(usage): Mention the --output option.
	(open_output_file): New function.  Create a filepath for an output
	file and open it.
	(extract_file): Use open_output_file().
	(open_output_file):
	* testsuite/binutils-all/ar.exp: Add a test of the new feature.
	* doc/binutils.texi: Document the new feature.
	* NEWS: Mention the new feature.
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