[libunwind] [libunwind] Remove unnecessary strcpy dependency (PR #72043)

[Louis Dionne via cfe-commits]

ldionne wrote:

This seems reasonable. I read the discussion about the size of the member but I think this is unlikely to change much -- plus I think the compiler should be able to diagnose in case the string becomes smaller and we'd be copying from a past-the-end location into the data structure: https://godbolt.org/z/qP736q5je

Clang doesn't warn right now but GCC does. I filed https://github.com/llvm/llvm-project/issues/72455 about that.

https://github.com/llvm/llvm-project/pull/72043