[Rpm-maint] [rpm-software-management/rpm] Support threading for zstd compression. (#1303)

[Michael Schroeder]

Note that the zstd people *did* say that threaded compression has a different output than unthreaded operation: it compresses a bit worse. So the pull request will break delta rpms.

Can you please change the code so that it uses unthreaded mode if there is no 'T' in the compression flags? I.e. initialize `threads` with 0 instead of -1?

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