[runtimes] Remove the ability to select the old libc++ testing format

As announced on libcxx-dev at [1], the old libc++ testing format is being
removed in favour of the new one. Follow-up commits will clean up the
code that is dead after the removal of this option.

[1]: http://lists.llvm.org/pipermail/libcxx-dev/2020-June/000885.html

GitOrigin-RevId: 5d838808854b9b6a7cb357d7768d37fc94fa7d73
1 file changed
tree: 44037df05b7812791c61c1f03121d09716d18c67
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT