Raspbian Linux 10 Buster fix. (Kernel 4.19)

[ev-mp]

The fix resolves compilation issues with Raspbian buster 10 distro:

• Add -latomic for ARM-based architectures
• Cast-away constness in rs-depth (gcc version 8.3.0 (Raspbian 8.3.0-6+rpi1))
• Replace deprecated define

Addresses #4986, mentioned in #4950, #4818

[jgwinner]

Question: did you already have the Realsense installed, then upgraded to Buster, or was this a fresh install?

    == John ==

[ev-mp]

@jgwinner , the RPI4 had Buster pre-installed , so it was a build from scratch.
I don't have a first-hand info regarding issues with the previous Raspbian Stretch distro, but if those were related to rendering then Buster includes a new OpenGl driver which seem to works quite well.

[jgwinner]

Thanks. It's really weird, at least two people couldn't get it to work at all. In my case, I used NOOBS 3.2, so maybe there's a difference from what yours was shipped with, and what you can now download.