More meaningful SKIP messages for macOS
More meaningful SKIP messages for macOS

Otherwise, it's quite hard to understand why the test is skipped in CI
without looking into the code

Change-Id: I5e4450c22c6b0474dac291d488e8f49d0607e290
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>

qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs