riscv64: can't build on FreeBSD with cgo [1.24 backport]

[gopherbot]

@mengzhuo requested issue #73516 to be considered for backport to the next 1.24 minor release.

@gopherbot Please backport to 1.23 and 1.24, it's blocking Go building on FreeBSD

[mrkfrmn]

We reviewed this cherry-pick candidate during a release weekly meeting, and, considering that it is a Go porting policy requirement for ports to have a working builder, the next steps here are to mark the port as broken until a builder can be restored.

I will fill out the CL for cmd/dist.

[gopherbot]

Change https://go.dev/cl/691835 mentions this issue: cmd/dist, internal/platform: mark freebsd/riscv64 broken

[dmitshur]

Copying @mengzhuo's comment from the (now closed) 1.23 backport issue here for visibility:

hi, the builder has back online recently and I have updated the related issue

#73568

You can check current status
https://chromium-swarm.appspot.com/botlist?c=id&c=task&c=os&c=status&d=asc&f=cipd_platform%3Afreebsd-riscv64&k=cipd_platform&s=id