Don't comment out code that Flatpak can't use

[jbicha]

Some of the code is commented out with this note NOT USED BECAUSE FLATPAK REMOVES ACCESS TO DEVICE FILES

Raider is available outside of Flatpak so if features work outside of Flatpak, these features should probably be available for people who are using Raider other than via Flatpak.

I believe it should be possible to detect at runtime whether Raider is running inside the Flatpak envivonment.

Otherwise, you could also use a meson option so that distros could enable the feature (although I think it would be better if it was enabled by default and the Flatpak build could disable it).

[ADBeveridge]

Flatpak now has USB portals, so I'm looking into implementing for flatpak as well. But if it turns out to not be feasible, I"ll go with conditional compilation.