[jdk17u-dev] RFR: 8285755: JDK-8285093 changed the default for --with-output-sync

Tue Jan 17 21:14:20 UTC 2023

This solves the regression from [JDK-8285093](https://bugs.openjdk.org/browse/JDK-8285093) backport. 

It manifests right now in `make test`, when the output from the tests would not show up until *all* tests complete.

Additional testing:
  - [x] Ad-hoc `make test` runs, observing the output is again live

-------------

Commit messages:
 - Backport ccf0e8bf9060bca010541b9851f4f39efe9cf375

Changes: https://git.openjdk.org/jdk17u-dev/pull/1081/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1081&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285755
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1081.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1081/head:pull/1081

PR: https://git.openjdk.org/jdk17u-dev/pull/1081