Add 'BuildRequires: golang(golang.org/x/crypto/ssh/terminal)'
    
    Not having golang.org/x/crypto/ssh/terminal explicitly listed as a
    BuildRequires isn't breaking the build at the moment.  However, since
    it's a direct dependency, and Toolbx is written in Go, it's good to
    explicitly list it due to the statically linked nature of Go binaries.
    It will make it easier to gauge the fallout from a security bug.
    
    There's no need to do a build just for this.