[libcxx-commits] [libcxx] [libc++] Make `std::lock_guard` available with `_LIBCPP_HAS_NO_THREADS` (PR #98717)

[Petr Hosek via libcxx-commits]

petrhosek wrote:

After doing more testing, I decide to exclude `std::unique_lock`, `std::scoped_lock`, and `std::shared_lock` since those have additional dependencies. The change should be ready for review as-is since all tests appear to be passing.  

https://github.com/llvm/llvm-project/pull/98717