RFR: JDK-8317866: replace NET_SocketAvailable

[Alan Bateman]

On Wed, 11 Oct 2023 07:58:21 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> When doing [JDK-8317603](https://bugs.openjdk.org/browse/JDK-8317603), it became clear that NET_SocketAvailable should be replaced.

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16139#pullrequestreview-1670860910