Stop holding hadrian back with backwards compatibility

[Richard Eisenberg]

> On Feb 10, 2021, at 8:50 AM, Simon Peyton Jones <simonpj at microsoft.com> wrote:
> 
> build with hadrian, and then continue using make with the artifacts (partially) built by Hadrian

I almost suggested that this had to be the reason for the back-compat design, but I assumed I had to be wrong. I also agree this is a non-goal; I'm quite happy to be forced to pick one or the other and stick with that choice until blasting away all build products.

Richard
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