Review Request: 8005347: build-infra: Verify 'gnumake source' at the top level works ok

[Tim Bell]

Hi Erik:

> Open part of this review. Configure needs to supply a couple of more 
> utilities and version string variations.
>
> http://cr.openjdk.java.net/~erikj/8005347/webrev.root.01/

Looks good.

Tim