[Rpm-maint] [rpm-software-management/rpm] RFE: allow choosing between sub-package and IO-stream threading in build (Issue #3161)

[Panu Matilainen]

rpmbuild parallelizes binary package creation based on available cpu/mem heuristic, and disables IO-level threading during OMP sections because those two systems have no means to communicate and negotiate appropriate resource consumption. 

Sub-package threading is generic and works reproducibly with all IO, but reputedly zstd produces identical output even when parallelized, and in *that* case it'd be beneficial to let the IO stream be parallelized instead. A relatively simple solution could be allowing users to switch between the two in configuration.

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