[CMake] packaging configuration files

[James C. Sutherland]

I have been using
	export_library_dependencies()
to incorporate library dependencies when generating configuration  
files for use with find_package()

However, I just discovered that this is a deprecated feature, and that
	install(EXPORT...)
should be used instead.

However, it is not clear to me how to incorporate dependencies when  
using the install(EXPORT) approach.  Are we now supposed to do this  
manually, or am I missing something?

Thanks,

James