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lang/rust: Add riscv64 (riscv64gc-unknown-freebsd) support
A kernel with COMPAT_FREEBSD11 is required for now like on all
other FreeBSD archs. FreeBSD11 never had riscv64 support, so
GENERIC does not have it and a kernel rebuild is required. The
same issue existed on powerpc64le.
The riscv64gc-unknown-freebsd target was upstreamed and will
be part of Rust 1.59.0 (2021-02-24).
Reviewed by: jrtc27, pkubaj
Differential Revision: https://reviews.freebsd.org/D32881