[update] update to upstream 5.1.0-beta1
Squashed 'qtsensors/' changes from e533f47..8b7ecd0

8b7ecd0 Add a private class to QSensorBackend
a8bb2b1 BlackBerry: Fix for GeoValues support
71b3901 Make it possible to bundle Android builds
5b11584 Fix some potential binary compatibility issues

git-subtree-dir: qtsensors
git-subtree-split: 8b7ecd0eb2d9f1e46835687593b6a7f4b14b1009
Merge commit '926b3c9d3f16a6ae7edb96dd0e1336e01c300779'