FetchContent: Remove unnecessary policy CMP0114 setting

Now that `CMAKE_VERSION` is at least 3.19, the policy will be set to NEW
implicitly by the version.

Modules/FetchContent/CMakeLists.cmake.in

@@ -2,7 +2,6 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 cmake_minimum_required(VERSION ${CMAKE_VERSION})
-cmake_policy(SET CMP0114 NEW)
 
 # We name the project and the target for the ExternalProject_Add() call
 # to something that will highlight to the user what we are working on if