Several tests fail when run using MSys/MinGW because `uname -s` doesn't have a corresponding case label. This patch fixes the problem for the shell tests in java/awt, java/lang, javax/imageio, and a few others.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Add MSys/MinGW support in various tests Changes: https://git.openjdk.org/jdk/pull/31261/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31261&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8385345 Stats: 24 lines in 15 files changed: 8 ins; 0 del; 16 mod Patch: https://git.openjdk.org/jdk/pull/31261.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31261/head:pull/31261 PR: https://git.openjdk.org/jdk/pull/31261
