[libunwind] Remove old keymgr related logic

keymgr used to be used on MacOSX <= 10.6, however we don't build libunwind
from scratch for such old systems anymore. Hence, this code isn't useful
anymore.

Differential Revision: https://reviews.llvm.org/D84677

GitOrigin-RevId: 145acacaea1d7fb4ffc055a3e92ee8fee7c58634
2 files changed
tree: aae9300d44377d41511f2d352b8d5c9bfc0db53e
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT