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.
Evolution maintainers should install this so they can safely open
GtkBuilder files in Glade 3 without Glade silently deleting custom
widgets it doesn't understand. The catalog makes it understand.
