Improve error message if `rake` is not found when building a "Rakefile" extension

[deivid-rodriguez]

If one of the dependencies uses rake to compile its extension, but doesn't declare rake as a dependency, one get an error like the one in #2326.

We could probably improve the error message to suggest potential remediation steps.

[simi]

Should we maybe warn on build time when Rakefile extension is provided, but rake is not added as a dependency?

[deivid-rodriguez]

I think that's a very nice idea.