RFR: 7537: Build script assumes that Darwin always targets x86_64

[Patrick Reinhart]

On Thu, 20 Jan 2022 10:38:35 GMT, Johannes Bechberger <duke at openjdk.java.net> wrote:

> Tested on Mac M1.

@thegreystone should we also open an issue for the Windows build script?

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PR: https://git.openjdk.java.net/jmc/pull/366