related to threadpool: reduce priority of worker threads slightly

[Max Dmitrichenko]

if about https://bitbucket.org/multicoreware/x265/commits/9ac15ef1fa4493e04b3889be695d3448d80cfa0c

was it measured if any performance or other impact(s)?

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[Max Dmitrichenko]

it seems to be pretty redundant.

any objection about removal of this commit?

and/or switching from “default” implementation into additional, controlled some parameters?