Silence swiftmodule timestamp warnings

As part of https://github.com/bazelbuild/bazel/pull/13091 dsymtuil started producing these warnings:

```
warning: Timestamp mismatch for bazel-out/ios-x86_64-min11.0-applebin_ios-ios_x86_64-fastbuild-ST-7786d55448f4/bin/Modules/DependencyInjection/DependencyInjection.swiftmodule: 2021-03-05 13:54:33.542331246 and 1969-12-31 16:00:00.000000000
```

In general we're happily ignoring this to get hermetic outputs instead (it's being compared against the file modification timestamp)

This change disables this warning.

It appears this feature has been around for at least 3 years https://github.com/apple/llvm-project/commit/2dd9848304c94b91399ad56189aa373fa9aebde6 so we should be good for all the versions of Xcode we support.

Relevant logic: https://github.com/apple/llvm-project/blob/902bb11a46eb82e81d7e8b34450481e143a208b2/llvm/tools/dsymutil/DwarfLinkerForBinary.cpp#L407-L421

Closes #13165.

PiperOrigin-RevId: 366215825
1 file changed
tree: e745ab56961c38e986afbe0bf7d6c81727ebbcf7
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEBASE.md
  15. CODEOWNERS
  16. combine_distfiles.py
  17. combine_distfiles_to_tar.sh
  18. compile.sh
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. distdir.bzl
  22. distdir_deps.bzl
  23. ISSUE_TEMPLATE.md
  24. LICENSE
  25. README.md
  26. WORKSPACE
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