These were generated by the autotools build. Some clients may depend on
these files instead of the newer split pkg-config files. New clients
should be using the toxcore, toxav, toxencryptsave, and toxdns modules.
This allows us to more clearly define interfaces between modules, and have the
linker help us ensure that module boundaries are respected.
The onion/tcp/net_crypto layer is a bit too large. This is due to a cyclic
dependency (onion -> net_crypto -> TCP -> onion). We may or may not want to
break that cycle in the future to allow the onion library to exist on its own
without net_crypto.
