RFR: 8353009: Document target selection flag for Windows AArch64 builds

[Magnus Ihse Bursie]

On Thu, 27 Mar 2025 19:38:28 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> Wait, are you saying you can get a native build to work by setting --build=aarch64-pc-cygwin? If so, then that's a better instruction IMO. 

No, it's not. If we could block the `--build` flag, we would. This is the built-in autoconf target/host/build system, that messes with the structure we use in OpenJDK (since we do not do canadian cross builds).

So if you need to add configure option, this would be the correct one.

However, we should be able to figure this out by ourselves. This can be solved by a patch in `config.sub` and/or `config.guess`.

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PR Comment: https://git.openjdk.org/jdk/pull/24267#issuecomment-2765781468