RFR: 8174269: Remove COMPAT locale data provider from JDK [v5]

[Magnus Ihse Bursie]

On Tue, 27 Feb 2024 00:24:08 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This PR intends to remove the legacy `COMPAT` locale data from the JDK. The `COMPAT` locale data was introduced for applications' migratory purposes transitioning to `CLDR`. It is becoming a technical debt and now is the time to remove it (we've been emitting a warning at JVM startup since JDK21, if the app is using `COMPAT`). A corresponding CSR has also been drafted.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Addressing review comments

This looks good from a build perspective. Actually, it looks great! :) I'm happy to get rid of this old strange construct.

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Marked as reviewed by ihse (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17991#pullrequestreview-1903238470