[CMake] Support for TARGET_INCLUDE_DIRECTORIES(), TARGET_LINK_DIRECTORIES and TARGET_ADD_DEFINITIONS()

[Mathieu Malaterre]

> If we were to implement those three commands, would there be any interest in
> merging this in the trunk?  We would hate to have to maintain our own
> parallel copy of cmake on all the platforms we need to support....


I volunteer for testing the patch :)
Those would be awesome features !

-Mathieu