Build: Don't explicitly set CMP0065 to NEW

This is no longer necessary, because of
1644bdb7d2.

CMakeLists.txt

@@ -1,9 +1,4 @@
 cmake_minimum_required(VERSION 2.8.12...3.28)
-# When using CMake 3.4 and later, don't export symbols from executables unless
-# the CMAKE_ENABLE_EXPORTS variable is set.
-if(POLICY CMP0065)
-  cmake_policy(SET CMP0065 NEW)
-endif()
 
 if(CMAKE_EXECUTABLE_SUFFIX)
   set(CMAKE_EXECUTABLE_SUFFIX_TMP ${CMAKE_EXECUTABLE_SUFFIX})