[Rpm-maint] [rpm-software-management/rpm] zstd compression: port to the new API. (#1303)

[Michael Schroeder]

You need to recreate the same bytewise identical compression when applying the deltarpm. The parallel compression implementations tend to partition the data and compress the chunks individually, leading to a different result.

I haven't checked the zstd implementation, I admit, I just know that this was the problem with parallel bzip2/xz compression.

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