[Rpm-maint] [rpm-software-management/rpm] [WIP] Use semaphore for compression in ZSTD. (#1349)

[marxin]

This proof-of-concept patch can handle when parallel compression happens in the context of parallel `.rpm` file creation.
It's mentioned here: #1324 and compression semaphore can handle that. `zstd` counterpart is here: facebook/zstd#2290.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1349

-- Commit Summary --

  * Use semaphore for compression in ZSTD.

-- File Changes --

    M build/pack.c (4)
    M rpmio/rpmio.c (4)
    M rpmio/rpmio.h (3)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1349.patch
https://github.com/rpm-software-management/rpm/pull/1349.diff

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https://github.com/rpm-software-management/rpm/pull/1349
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