[bug#44721] [PATCH] gnu: Add terraform.

[EuAndreh]

> Switching to v0.14.0-rc1 should probably break the
> build, and require the dependencies to be packaged individually.

It does break, I'll start doing it.

It would probably be better to work on a golang importer, and I'm more
inclined to do that to package Terraform instead of packaging every
dependency manually.

This will take a bit more work than I initially planned for, but I'm
still up for it.