Explicitly set Fn key as Mod5. In xkeyboard-config up to 2.36, this was somehow set implicitly, since it was working, although I am not sure where/how. In 2.37 it only works when specified. [ci:skip-build]: already built successfully in CI
Add rx-51 x11 keymap to device package in response to #1521 [ci:skip-build]: already built successfully in CI