It's actually the same as #946373 - it's not about adding the current directory to sys.path, it's adding the directory of a script that's in a world-writable directory (such as /tmp).

The difference is that the proposed solution this time recognises that simply not adding that directory would break the world, so it aims for a more nuanced approach (plus distutils itself writing a script to /tmp and then running it is just plain wrong).