[PATCH] Initial commit of Networking TS implementation

[Jonathan Wakely]

On 18/10/18 12:06 +0100, Renlin Li wrote:
>Hi Jonathan,
>
>I saw those tests failed to compile on baremetal targets with the following error:
>```
>libstdc++-v3/include/experimental/io_context:45: fatal error: poll.h: No such file or directory
>```

That error should be fixed at r265203 but the test will still fail
with a different error.

>Should we add a check to prevent it from running on unsupported platforms?

Yes, I've been trying to decide what the right target selector is.

Those tests will fail for baremetal and *-*-mingw* and probably
other targets too.