Add aktualizr's main.cc to clang-check input.
Add aktualizr's main.cc to clang-check input.

advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/aktualizr,advancedtelematic/sota_client_cpp,advancedtelematic/sota_client_cpp