AthenaMPTools: disable thread-checker
Thread-checker was accidentally enabled in !54586 (merged) for this package.
Fixes build warnings in nightly (the CI didn't show these because it didn't actually have to rebuild this package).
Thread-checker was accidentally enabled in !54586 (merged) for this package.
Fixes build warnings in nightly (the CI didn't show these because it didn't actually have to rebuild this package).