[libcxx-commits] [libcxx] [libc++][NFC] Remove availability annotations which can never be triggered (PR #69226)

[Louis Dionne via libcxx-commits]

================
@@ -41,7 +41,7 @@
 #   error "__cpp_lib_shared_mutex should not be defined before c++17"
----------------
ldionne wrote:

We're missing cleanups in `libcxx/utils/libcxx/test/features.py` for things like `availability-bad_variant_access-missing`.

https://github.com/llvm/llvm-project/pull/69226