RFR: Improve and modernize the makefile

Tue Mar 16 14:13:20 UTC 2021

On Tue, 16 Mar 2021 13:26:20 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Actually, I thought of this as a pre-requirement for the git rewrite... I started writing but just got lost in this huge index.md file.
>
> Git is excellent at tracking file renames and merges/splits, so let's not fear future possible refactorings as a blocker for building a proper foundation.

(Also, we are both commenting on the wrong PR. I assume you are really referring to the changes in #47 :-))

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PR: https://git.openjdk.java.net/guide/pull/46