Enable a bunch of useful CMake policies.

CMakeLists.txt

@@ -27,6 +27,20 @@ cmake_minimum_required(VERSION 3.4)
 
 project(MagnumBindings CXX)
 
+# Don't restrict INTERPROCEDURAL_OPTIMIZATION only for icc on Linux
+if(POLICY CMP0069)
+    cmake_policy(SET CMP0069 NEW)
+endif()
+# If CMAKE_AUTOMOC is set, all uses of corrade_add_resource() would otherwise
+# complain on 3.10 that AUTOMOC is not processing GENERATED files
+if(POLICY CMP0071)
+    cmake_policy(SET CMP0071 NEW)
+endif()
+# Superprojects can use just set(WITH_BLAH ON) without FORCE CACHE on 3.13+
+if(POLICY CMP0077)
+    cmake_policy(SET CMP0077 NEW)
+endif()
+
 # Use folders for nice tree in Visual Studio and XCode
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)