Don't install any copies of Korman that might be lurking inside the
Blender directory. This can easily result in interesting race conditions
where we can't predict what exactly will be installed. Worse, if the
korman installed to Blender is a Windows directory junction, then CPack
will fail with an inscrutable error.
This will allow us to automate releases with the Blender 2.79
"experimenntal nightly" codebase. This is great because the newer
Blender uses Python 3.7 (instead of 3.5). This pulls from my fork of
Blender, which has a number of build improvements added on top.