RFR: Copy powershell script in make build as well

[Maurizio Cimadamore]

On Tue, 10 Sep 2024 13:47:34 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> I noticed that the powershell script we added is only being copied to the output directory as part of the gradle build. This PR makes it so we also copy it in the make build.

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jextract/pull/260#pullrequestreview-2292673234