mac: support ULMO (lzma) in pkg-dmg
Disk images produced with this compression can only be created and mounted on macOS 10.15 (“Catalina”) and later. This may be useful in the near term for things shipped to arm64 users, as the baseline OS for mac-arm64 is macOS 11.0 (“Big Sur”). This also adds ULFO (lzfse/lzvn) support to pkg-dmg, but that’s not interesting and I doubt we’ll ever use it. Bug: 1130557 Change-Id: I1ba54b8fcc0a69d8770af98a364123b64e24423b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505683Reviewed-by:Avi Drissman <avi@chromium.org> Commit-Queue: Avi Drissman <avi@chromium.org> Auto-Submit: Mark Mentovai <mark@chromium.org> Cr-Commit-Position: refs/heads/master@{#821992}
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