[cmake-developers] Interface includes and defines plumbing

[Stephen Kelly]

Stephen Kelly wrote:

> If, you agree, I'll merge this to next.

I've also pushed a LINK_LIBRARIES-property branch, and a 
INTERFACE_LINK_LIBRARIES-genex branch to gitorious.

If you can review them and tell me they're fine, modulo what the dashboard 
says, I can have them dashboard-clean and we can get them all merged early 
next week.

Thanks,

Steve.