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supervisor: Fall back to a scanning /proc if CONFIG_PROC_CHILDREN is off

Ryan Gonzalez requested to merge wip/refi64/supervisor-fallback into main

Without CONFIG_PROC_CHILDREN, task/TID/children is unavailable, so we can't use it to track child processes. Instead, we can just scan /proc for child processes by checking their PPid.

Fixes: https://gitlab.steamos.cloud/steamrt/tasks/-/issues/445

Signed-off-by: Ryan Gonzalez ryan.gonzalez@collabora.com

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