RFR: JDK-8290460: Alpine: disable some panama tests that rely on std::thread

[Jorn Vernee]

On Mon, 18 Jul 2022 14:21:19 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Until [JDK-8290059](https://bugs.openjdk.org/browse/JDK-8290059) is solved, I'd like to disable
> 
> - java/foreign/TestUpcallAsync.java
> - java/foreign/enablenativeaccess/TestEnableNativeAccess.java
> 
> on muslc to take load from our CIs.
> 
> Tests: tested locally that the tests are excluded on Alpine, and remain active on other platforms.

LGTM.

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Marked as reviewed by jvernee (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9539