pkgng/pkgng d34c8d9docs pkg-create.8, libpkg packing.c pkg_jobs.c

Add support for zstd compression format where supported
DeltaFile
+16-0libpkg/packing.c
+7-2src/create.c
+2-1libpkg/pkg_jobs.c
+1-1docs/pkg-create.8
+1-1libpkg/pkg_repo_meta.c
+1-1scripts/completion/_pkg.in
+1-1libpkg/pkg.h.in
+29-77 files

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