error: undefined symbol: main in poudriere jail

[Lorenzo Salvadore]

> I am testing both the actual version of brlcad and your changes. Since I have a
> slow computer, this will take some time (if someone else with a more powerful
> computer can perform the tests in less time it is welcomed).

I have finished testing. While the actual version of brlcad fails to build for me,
your changes worked: the build was successful (on poudriere with a jail with
11.2-RELEASE).

Lorenzo Salvadore.