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

[Igor Raits]

With my suggestions, and a proper build of libzstd in Fedora it works as expected, it fully utilizes my system. Testing on `xonotic-data` which is 873M.

```
before: 
284.05user 3.03system 4:48.64elapsed 99%CPU (0avgtext+0avgdata 153540maxresident)k
88inputs+5456312outputs (1major+80373minor)pagefaults 0swaps

after:
578.54user 5.56system 1:36.86elapsed 602%CPU (0avgtext+0avgdata 1409788maxresident)k
104inputs+5455928outputs (1major+386345minor)pagefaults 0swaps
```

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