adb is going to start using shiny new C++17 features like std::optional in headers that minadbd includes. Test: mma Change-Id: I7eb100c48abbf2364d6ff5f30aa223480e2466a6
minadbd is now mostly built from libadbd. The fuse features are unique to minadbd, and services.c has been modified as follows:
- all services removed
- all host mode support removed
sideload_service()added; this is the only service supported. It receives a single blob of data, writes it to a fixed filename, and makes the process exit.