Failed to build in a riscv linux: ring 0.16.20

[ddwolf]

Two Errors:

I can not get text out of the environment, sorry for the inconvenience.

1. 
2. 

[Kobzol]

Looks like the ring crate cannot be built on your system? In general, rustc-perf currently mostly only supports x64 Linux, and to a lesser extent x64 Windows. Anything else is untested and might not work.