Upstream now only generates CMake files on Windows, so remove all
references to CMake.
A zsh completion is now installed, remove this for now as we don't really
use zsh.
(From OE-Core rev: 94cf6ef11bba381ab6f65b03ed1ed14022438151)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>