[CMake] cmake rewrites part of -S argument depending on the current directory!

[Brad King]

On 5/30/19 3:22 AM, Marc Herbert wrote:
> IF the current directory is a parent of the -S argument AND
> one component of the current directory is a symbolic link THEN
> the leading part of the -S argument is overridden using that
> symbolic link.

See this issue:

  https://gitlab.kitware.com/cmake/cmake/issues/16228

-Brad