Revert "cmake: manual handling of CMakeCheckCompilerFlag.cmake inclusion"

With the change to cmake_minimum_required(VERSION 3.20.0) then this
commit is no longer needed.

This reverts commit 6ca2bf25cb1da64edef1fe7592ab6fccdd4a16f7.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
1 file changed