Pass -J to tar for xz decompression
Pass -J to tar for xz decompression

Some tar implementations can't auto-detect compression formats, so
they must be specified explicitly.

(cherry picked from commit 43eb7b6756a6441c8901342d657d299a6efdefbc)

dtzWill/nix,dtzWill/nix,dtzWill/nix,dtzWill/nix,dtzWill/nix