Tests: Use newer policy settings in RunCMake.install test

In particular, avoid CMP0042 warnings on OS X.

Tests/RunCMake/install/CMP0062-NEW.cmake

@@ -1,4 +1,4 @@
-
+cmake_policy(VERSION 3.2)
 cmake_policy(SET CMP0062 NEW)
 
 add_library(iface INTERFACE)

Tests/RunCMake/install/CMP0062-OLD.cmake

@@ -1,4 +1,4 @@
-
+cmake_policy(VERSION 3.2)
 cmake_policy(SET CMP0062 OLD)
 
 add_library(iface INTERFACE)

Tests/RunCMake/install/CMP0062-WARN.cmake

@@ -1,3 +1,4 @@
+cmake_policy(VERSION 3.2)
 
 add_library(iface INTERFACE)
 export(TARGETS iface FILE "${CMAKE_CURRENT_BINARY_DIR}/exported.cmake")

Tests/RunCMake/install/CMakeLists.txt

@@ -1,3 +1,3 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.4)
 project(${RunCMake_TEST} NONE)
 include(${RunCMake_TEST}.cmake)