Linux: Don't use udev for joypad hotloading when running in a sandbox #76961
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udev doesn't work in sandboxes, notably the new Steam container runtime as found notably on the Steam Deck, and in Flatpak/Snap packages.
Like SDL does, when we detect such a containerized environment, we fall back to parsing
/dev/input
directly.See smcv's comments in #76879 for details.
Fixes #76879.
3.x
backport: #76962.