Android native camera library is not chosen automatically

[ayberkozgur]

OpenCV relies on OpenCV Manager to get the correct libnative_camera_r*.so in place so that it can be loaded with the libnative_camera_r prefix without paying attention to the version. This doesn't allow a scenario where OpenCV Manager is not used and all of libnative_camera_r*.so are bundled with the APK for cross-version compatibility. A rewrite of https://github.com/Itseez/opencv/blob/master/modules/androidcamera/src/camera_activity.cpp#L167 is needed. This is best submitted as a PR to OpenCV itself. If this PR is rejected, https://github.com/Itseez/opencv/blob/master/modules/androidcamera/src/camera_activity.cpp will be forked to CVCamera.

For now, bundling the correct version for your device is the only solution.