Fix cad/kicad{-devel} in advance of CMake 3.11. Remove old duplicate CMake
module.

The old modules use CMake internals that are going away in 3.11;
this particular module has been shipped with CMake since 3.0 at least,
so it's just not necessary except on silly ancient platforms.

Reviewed by: thierry (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D14772