Disable implicit fallthrough warning for zlib

https://logs.chromium.org/logs/crashpad/buildbucket/cr-buildbucket.appspot.com/8903960674082840512/+/steps/compile_with_ninja/0/stdout

I don't understand how this lingered for so long as I can't see what
changed. mini_chromium has had -Wimplicit-fallthough enabled for a long
time (https://chromium-review.googlesource.com/899847), and zlib DEPS
hasn't changed in a long time either
(https://chromium-review.googlesource.com/438585).

The most likely would presumably be that the compiler started
not-ignoring the enabling of the warning? But that doesn't seem too
likely either.

Bug: crashpad:309
Change-Id: Iea80eae54f6924e1c1854f775f634fcdb1b25e62
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/1772205
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
GitOrigin-RevId: 50aa576622fdaba476ea6c308616605922c5bafa
3 files changed
tree: 05a9ec1ba21991b69d857ecf9635ab06951fb72c
  1. build/
  2. client/
  3. compat/
  4. doc/
  5. handler/
  6. infra/
  7. minidump/
  8. snapshot/
  9. test/
  10. third_party/
  11. tools/
  12. util/
  13. .clang-format
  14. .gitignore
  15. .gn
  16. .vpython
  17. AUTHORS
  18. BUILD.gn
  19. codereview.settings
  20. CONTRIBUTORS
  21. crashpad.gyp
  22. DEPS
  23. LICENSE
  24. navbar.md
  25. package.h
  26. README.md
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Crashpad is a crash-reporting system.

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