If `USER` was unset, logging would crash immediately. `USER` is *not* a guaranteed variable, so to get around this we add a null fallback and also prefer `LOGNAME`, which is "standard" on POSIX systems (yet half the time isn't set because fuck me I guess)
Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3021
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Maufeat <sahyno1996@gmail.com>
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