libunwind: Implement the unw_strerror function for better nongnu libunwind compatibility (#160887)

As it was explained to me in
https://discourse.llvm.org/t/libunwinds-raison-detre/88283/2 the LLVM
version of libunwind is mostly compatible with nongnu one. This change
improves the compatibility a bit further.

NOKEYCHECK=True
GitOrigin-RevId: 54659793328a0a7f0f1efa9d4d7fc43999b34ae2
3 files changed
tree: daf3516ad94415ca591be78b14a9f5fd5b650530
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT