[libunwind] [libunwind][nfc] Avoid type warning of debug printf (PR #67390)

[Alexander Richardson via cfe-commits]

https://github.com/arichardson commented:

Could also use %p instead of `0x% Pri*`and cast the `uintptr_t` to `void *`? That would avoid the need for the new macros.

https://github.com/llvm/llvm-project/pull/67390