Use pkg_config for zstd and make it private for 'v55r14-patches'

Miroslav Saurrequested to merge
cherry-pick-bd4d042f into v55r14-patches

Use pkg_config for zstd and make it private (cherry-pick !4507 (merged))

See merge request !4782 (merged)

(cherry picked from commit bd4d042f)

13ddb336 Merge branch 'ra-zstd-pkgconfig' into 'master'

Co-authored-by: Miroslav Saur miroslav.saur@cern.ch

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