NDK 19 and 20 support

Successfully tested to build Tensorflow's Android app on `4f9ae09cff5f357eb8260c468fbf22828f58e4b6` (HEAD today) with `bazel-dev build //tensorflow/examples/android:tensorflow_demo --cxxopt='--std=c++11' -c opt --fat_apk_cpu=x86,armeabi-v7a`

This change includes:

* Support for building with NDK 19 and 20
* Simplifying crosstool building by centralizing common configuration in `AndroidNdkCrosstoolsR19`.
* Applying recommended flags documented in the [NDK Build System Maintainer's Guide](https://android.googlesource.com/platform/ndk/+/ndk-release-r19/docs/BuildSystemMaintainers.md#build-system-maintainers-guide)

This change doesn't contain support for `lld` or use the new standalone GCC tools yet. These will come in a follow up PR.

RELNOTES: Added support for Android NDK 19 and 20.

Closes #8524.

Change-Id: I800b3661b24057316cbb537d51e6ba346cc30f45
PiperOrigin-RevId: 250911997
7 files changed
tree: 1954c06c155f4eff8a412f8c14723283b3ac3183
  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. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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