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

Mon Jul 18 14:29:16 UTC 2022

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.

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Commit messages:
 - Disable tests

Changes: https://git.openjdk.org/jdk/pull/9539/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9539&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290460
  Stats: 3 lines in 2 files changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9539.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9539/head:pull/9539

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