[libunwind] Remove unused substitution in AIX libunwind config

It must have been a copy-paste error, since cxx-include is never defined
by the libunwind config.

Differential Revision: https://reviews.llvm.org/D131030

GitOrigin-RevId: 44b4f4df31ab71457ecd7127e64526cd8237bfa4
1 file changed
tree: db81a5f271003afa9b0b7d01f69e3d535281e03e
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT