[bazel] Use hermetic Android NDK C++ toolchain in CI tasks.

Bug: skia:12400
Change-Id: I682ca4af5fe9087735e80267e89510886159d9c4
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/529340
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Leandro Lovisolo <lovisolo@google.com>
2 files changed