cmd/link/internal/riscv64: add support for freebsd/riscv64
Updates #53466
Change-Id: Ifa1b8fe79f952a08dbdf91ae5ab23e4431e66134
Reviewed-on: https://go-review.googlesource.com/c/go/+/431660 Reviewed-by: Dmitri Goutnik <dgoutnik@gmail.com>
Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: Joel Sing <joel@sing.id.au>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>