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io: make max unbounded io worker configurable

Florian Fischer requested to merge aj46ezos/emper:configurable-iow-count into master

Since Linux 5.15 io_uring can limit the number of iow threads created using IORING_REGISTER_IOWQ_MAX_WORKERS.

Expose this via the meson variable io_unbounded_iow_max and the environment variable EMPER_IO_UNBOUNDED_IOW_MAX.

See for an detailed explanation:

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