[PATCH][libstdc++-v3, fuchsia] Add support for fuchsia targets to libstdc++

[Jonathan Wakely]

On 17/01/17 13:15 -0800, Josh Conner via libstdc++ wrote:
>This patch adds fuchsia support to libstdc++. OK for trunk?

Is fuchsia only supported as a cross-compiler target, not native?