vsdownload: Add an option to specify target architectures

[huangqinjin]

No description provided.

[mstorsjo]

Thanks for working on this!

[huangqinjin]

OK. I will retain Microsoft.VisualStudio.Workload.VCTools and install all architectures by default, To make this PR "No Functional Change" as possible.

[mstorsjo]

OK. I will retain Microsoft.VisualStudio.Workload.VCTools and install all architectures by default, To make this PR "No Functional Change" as possible.

Nice, thanks! That makes it easier to proceed. :-)

I also thought we could accept the choices e.g. native (or host) and all, as explicit shorthand choices. (Being able to do --architectures all is a bit easier than having to list all of them.)

[huangqinjin]

I also thought we could accept the choices e.g. native (or host) and all, as explicit shorthand choices.

That is a good idea. host is a good shorthand choice. For all, user can just omit the --architecture option.

[mstorsjo]

Looks good now, thanks!