[kernel][no-userabi] in the kernel_no_userabi case turn off some code

A few places that assume some symbols are declared in lib/userabi are
referenced in VM and unittest code. Add a #define to the kernel and
switch off some code based on it.

Needed to link a functional kernel with the switch set.

Change-Id: If00cccd533318f5f4c4df51343e637996b22ddb5
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/822200
Reviewed-by: Roland McGrath <mcgrathr@google.com>
Fuchsia-Auto-Submit: Travis Geiselbrecht <travisg@google.com>
Commit-Queue: Travis Geiselbrecht <travisg@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
3 files changed
tree: 244116d224678ee0d416cbeeda0db7a7e039a5de
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gitmodules
  20. .gn
  21. .ignore
  22. .style.yapf
  23. analysis_options.yaml
  24. AUTHORS
  25. BUILD.gn
  26. CODE_OF_CONDUCT.md
  27. CONTRIBUTING.md
  28. fuchsia.code-workspace
  29. LICENSE
  30. OWNERS
  31. PATENTS
  32. pyrightconfig.json
  33. README.md
  34. rustfmt.toml
README.md

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