Skip tests that depend on Android NDK samples if they are missing.
Skip tests that depend on Android NDK samples if they are missing.

As of Android NDK r11, samples have been moved out of the NDK and into
an external repository.

Task-number: QBS-944
Change-Id: I826722d86c3bc4202716431d6e94507e78f8b793
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@theqtcompany.com>

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