[libunwind] Remove unused _LIBUNWIND_HAS_NO_THREADS macro in tests

The _LIBUNWIND_HAS_NO_THREADS macro is only picked up by libunwind
inside its sources, so it is only required when it builds. It doesn't
need to be defined when running the tests.

NOKEYCHECK=True
GitOrigin-RevId: a5f36259a20533d9c970ab6a5faab7cf341ca1c9
3 files changed
tree: aa560f04714c7aeb2136de18a983584a741f37c3
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT