[PATCH] ar --output support

[Fāng-ruì Sòng via binutils]

https://sourceware.org/ml/binutils/2019-10/msg00186.html

> > There is a proposal https://reviews.llvm.org/D69418 that adds --output
> > to llvm-ar. --output specifies the output directory for the x (extract)
> > operation. Does GNU ar want to do the same?
>
> Yes.  It would be very helpful for users if both versions of the tool
> behaved in the same way and supported the same options.
>
> Are you volunteering to submit a patch to add this behaviour ?
>
> (I ask because I am lazy/busy and if you are willing to do the work
> then that would be grand.  But if not, then I will take on the task
> myself).
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