[Cdash] Flag test as skipped or not run at runtime

[David Cole]

>> The fix for this bug http://public.kitware.com/Bug/view.php?id=8466


> Here's another related property that can you help mark a test as "not
> run" in some situations:
>
>
http://www.cmake.org/cmake/help/v2.8.11/cmake.html#prop_test:REQUIRED_FILES


The new property in CMake 3 is named SKIP_RETURN_CODE, and is
documented here:

http://www.cmake.org/cmake/help/v3.0/prop_test/SKIP_RETURN_CODE.html