Silence CMake link interface warning

We don't modify the link interface directly so these warnings are
just useless noise. We could in theory use the new naming instead,
but at least CMake 2.8.12 is buggy and screws up the link when that
policy is active.

CMakeLists.txt

@@ -3,6 +3,7 @@
 #
 
 cmake_minimum_required(VERSION 2.8)
+cmake_policy(SET CMP0022 OLD)
 
 # Internal cmake modules
 set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)