[Reproducible-builds] Bug#808002: diffoscope: Add support for Mozilla-optimized ZIPs

[Mike Hommey]

Source: diffoscope
Version: ada1a1dcdc19217fb611e0a1e57bc3744399aefa
Severity: wishlist
Tags: patch

It would be useful for diffoscope to output differences in omni.ja files as
for other Zip files, instead of ending up with a diff of an hexdump.

The attached patch implements a minimal support for this. It however doesn't
look at the difference in the `preload` value.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
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