We have a confusing array of nearly-identical CFLAGS/LIBS definitions in
configure.ac. Time to simplify. Instead let's just have one definition
that includes all the libraries provided by Evolution-Data-Server (incl.
Camel). That, in combination with GNOME_PLATFORM, gives us most of what
we need for compliation and linking, and we can sprinkle definitions for
additional library dependencies in Makefile.am's as needed.
This demonstrates how to extend EShell without having to modify and
recompile e-shell.c. If NetworkManager integration is enabled, the
extension is loaded automatically when the EShell is created.
The same pattern can be applied to integrate other network monitoring
software like ConnMan or Microsoft's Wireless Zero Configuration.