a87a9625f8
Let's drop support systems lacking memfds, i.e. pre kernel 3.17 systems. This allows us to drastically simplify the "data fd" concept, so far that we can remove it entirely. This replaces acquire_data_fd() with a specialized call to memfd_new_and_seal(), not that memfds can be the only implementation of the concept.
System and Service Manager
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