[CMake] set_source_files_properties per configuration

[Simmons, Aaron]

>Well, there's this:
>
>http://www.cmake.org/cmake/help/cmake-2-8-docs.html#prop_sf:COMPILE_DEFINITIONS_CONFIG

Ah, that's what I was looking for.  Fortunately I only need to set per-configuration definitions and not full-on compiler args.  Thanks.