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

[Igor Raits]

@ignatenkobrain commented on this pull request.



>  	    goto err;
 	}
+
+	if (threads > 0)
+	  if (ZSTD_isError (ZSTD_CCtx_setParameter(_stream, ZSTD_c_nbWorkers, threads)))

hmmpf, this always gives me an error on Fedora Rawhide:

```
warning: zstd library does not support multi-threading
```

With `ZSTD_getErrorName()` I get `Unsupported parameter`.

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