We're suddenly getting a few integration jobs failing in CI on arm macOS machines in different repositories.

This is using CMake 3.20.5 and whatever ninja version is provisioned on the arm machines.

ninja: error: manifest 'build.ninja' still dirty after 100 tries

https://testresults.qt.io/coin/integration/qt/qt5/tasks/web_qt_qt5_1626880694600

https://testresults.qt.io/coin/logview/qt/qtserialbus/f77c74641d48cd7ca5dbfbd26f17d037ac1a56d6/MacOSMacOS_11_00arm64MacOSMacOS_11_00arm64Clangqtci-macos-11.0-arm64TestOnly/9fc0c4e01eb7d3f16b07ced7e9adc4a9cbdc7c62/test_1626888444

https://testresults.qt.io/coin/integration/qt/qt5/tasks/web_qt_qt5_1627032620291

https://testresults.qt.io/coin/logview/qt/qtsensors/6952c755b36f59d86ea45f2e646cfc9ca3790463/MacOSMacOS_11_00arm64MacOSMacOS_11_00arm64Clangqtci-macos-11.0-arm64TestOnly/fac8ec6964be6363bf4448b7f3aabaca736332fa/test_1627037064

https://testresults.qt.io/coin/logview/qt/qtwebchannel/3efe3acfb7c320b4cb78191bd8d59b35056c891e/MacOSMacOS_11_00arm64MacOSMacOS_11_00arm64Clangqtci-macos-11.0-arm64/1cbcd9d9aea30e1e88644c6971fa8c487b288a4f/build_1627036394

Last comment on https://github.com/ninja-build/ninja/issues/1599 suggests it might be a system time issue.

https://github.com/ninja-build/ninja/issues/1704 suggests it happens with files with modification times in the future.