[libunwind] Add SME detection for ZA test on OpenBSD / FreeBSD (#193148)

Follow up to 588451c160c34b888ced1c3d9263d361df22f757 to
add SME detection on OpenBSD and FreeBSD.

GitOrigin-RevId: bffb208404fd2287e68f2cb3ce7f10ac99e38ac1
5 files changed
tree: d22459597aaa3f662726cc3c4fb51dbad9d2e8fe
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT