JOHNE - Flesh in some detail for our pkg-config stuff
JOHNE - Flesh in some detail for our pkg-config stuff

This is a first attempt to add some meaningful detail for later processing by pkg-config (although in the case of MB3Cairomm, everything was more-or-less right anyway). We mostly need to specify the library requirements / cflags etc, at some point.

johne53/MB3Cairomm,johne53/MB3Cairomm,johne53/MB3Cairomm,johne53/MB3Cairomm