tools: cleanup no-build and build-only options

As the `no-build` and `build-only` options are not used anymore, they
can be safely removed.

PR-URL: https://github.com/nodejs/node/pull/7620


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>