[CMake] Tests with custom launchers and "Not Run"

[Mathias Gaunard]

Hi,

When not using a custom launcher for a test, if the executable doesn't 
exist then ctest will report "Not Run".

Is there a way to do this with a custom launcher as well? When the file 
doesn't exist it always gives me "Failed" instead.

I need to run my tests in qemu because of cross-compilation, and because 
of this all my "Not Run" tests end up being marked as "Failed", which is 
a bit annoying.