www/unit*: Remove use to DO_NADA

[lwhsu]

Summary

www/unit*: Remove use to DO_NADA

Test Plan

Poudriere build and test run

[osa]

LGTM. Li-Wen, I do believe that poudriere(8) build all packages well.

It's probably necessary to bump PORTREVISION to rebuild these packages.

[lwhsu]

In D47225#1077454, @osa wrote:

LGTM. Li-Wen, I do believe that poudriere(8) build all packages well.

Thanks, it does.

It's probably necessary to bump PORTREVISION to rebuild these packages.

I think it's not necessary as we're only simplifying the Makefile but the final package shouldn't be affected.