r258720 - [MSVC Compat] Only warn for unknown clang-cl arguments

[Reid Kleckner via cfe-commits]

On Tue, Jan 26, 2016 at 4:36 AM, Joerg Sonnenberger via cfe-commits <
cfe-commits at lists.llvm.org> wrote:
>
> Is this really a good idea? Yes, there are many broken configure
> scripts, but at the same point, this change makes it more difficult
> to detect whether an option is supported.
>

Of course it's bad behavior, but it's exactly what cl.exe does, and I think
we should do it for compatibility. Firefox's autoconf build by itself isn't
motivating enough, but I expect there are dozens of other Rube Goldberg
build systems out there that need this.
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