Add another boost component I'd forgotten about.
Add another boost component I'd forgotten about.

Technically this isn't a "real" boost library, it's just a header that
we took from the internet and copied into our code, but still, it
counts.

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