RFR: 8350497: os::create_thread unify init thread attributes part across UNIX platforms

[David Holmes]

On Mon, 24 Feb 2025 10:03:22 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> In os::create_thread the 'init thread attributes' part of the method should be unified across UNIX platforms, e.g. regarding return code checking.

Looks fine and trivial.

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23746#pullrequestreview-2640309835