RFR: 8340623: remove outdated PROCESSOR_ARCHITECTURE_IA64 from Windows coding

[Alan Bateman]

On Mon, 23 Sep 2024 08:05:55 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> We still check for PROCESSOR_ARCHITECTURE_IA64 but this is not supported any more for a very long time in OpenJDK.

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21130#pullrequestreview-2321461289