vmactions/openbsd-vm now provides OpenBSD 8.0 by default with Clang 22.1.6, which triggers -Wc2y-extensions on __COUNTER__.
Disable the warning temporarily until the fix becomes available in Clang.
See upstream LLVM items:
- https://github.com/llvm/llvm-project/issues/196557
- https://github.com/llvm/llvm-project/pull/196689
- https://github.com/llvm/llvm-project/pull/218669
Related: