cmake: Clean up policy code

Now that the min is 3.13 these policies don't need to be set
manually anymore.

CMP0054 - 3.1
CMP0063 - 3.3
CMP0069 - 3.9
CMP0077 - 3.13

CMakeLists.txt

@@ -3,14 +3,6 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-if (POLICY CMP0069)
-  cmake_policy(SET CMP0069 NEW)
-endif (POLICY CMP0069)
-
-if (POLICY CMP0077)
-  cmake_policy(SET CMP0077 NEW)
-endif (POLICY CMP0077)
-
 project(googletest-distribution)
 set(GOOGLETEST_VERSION 1.13.0)