cmake HAVE_UNW_ADD_DYNAMIC_FDE examples

Lewuathe/mlir-hello thirdparty/llvm-project/llvm/cmake/config-ix.cmake :313 

check_symbol_exists(__unw_add_dynamic_fde "${CMAKE_CURRENT_LIST_DIR}/unwind.h" HAVE_UNW_ADD_DYNAMIC_FDE)

root-project/root interpreter/llvm-project/llvm/cmake/config-ix.cmake :276 

check_symbol_exists(__unw_add_dynamic_fde "${CMAKE_CURRENT_LIST_DIR}/unwind.h" HAVE_UNW_ADD_DYNAMIC_FDE)