Updated librealsense2 to version 2.38.1

[cansik]

This PR updates the librealsense2 library to version 2.38.1 which supports newer devices like the RealSense L515 (LIDAR). There were not that many changes necessary, mainly the libtm which has been replaced with tm2.

I could just test the library on MacOS but there the new devices are recognized and an output image could be captured.

I was not sure if it's necessary to update the number 1.5.4 to 1.5.5, but I did it. Maybe you would like to change it (back or to another version).

[saudet]

Thanks for the update! Use 1.5.5-SNAPSHOT for the version until it gets released.
Before we can merge though we'll need the builds to pass. They are currently on Linux and Windows:
https://travis-ci.org/github/bytedeco/javacpp-presets/builds/728431118
https://ci.appveyor.com/project/Bytedeco/javacpp-presets/builds/35285006

[saudet]

On Linux, we can get the video.h, etc files as with this patch used for librealsense:
https://github.com/bytedeco/javacpp-presets/blob/master/librealsense/librealsense.patch
For Windows, we'll need to skip the missing symbols, which are undefined anyway, so we don't lose anything.

[cansik]

I will have a look at it tomorrow! Thx for the investigation.

[saudet]

Actually, the patch is already there for librealsense2 as well, but it's a bit broken...