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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}