Xous is a microkernel operating system designed to run on small systems.
The kernel contains a wide range of userspace processes that provide
common services such as console output, networking, and time access.
The kernel and its services are completely written in Rust using a
custom build of libstd. This adds support for this target to upstream
Rust so that we can drop support for our out-of-tree `target.json` file.
Add a Tier 3 target for Xous running on RISC-V.
Signed-off-by: Sean Cross <sean@xobs.io>
9f6e6872c2