RFR: 8308969: make test-prebuilt doesn't return the correct exit code

[Antonios Printezis]

For 'make' test and 'make test-only' the existence of exit-with-error is checked in the main target in Init.gmk. Is there a better way to fix this than to check for the existence of exit-with-error in RunTestsPrebuilt.gmk?

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Commit messages:
 - 8308969: make test-prebuilt doesn't return the correct exit code

Changes: https://git.openjdk.org/jdk/pull/14183/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14183&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308969
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14183.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14183/head:pull/14183

PR: https://git.openjdk.org/jdk/pull/14183