Silence warning in CMake 2.8.12 and later

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1151 632fc199-4ca6-4c93-a231-07263d6284db

diff --cc CMakeLists.txt
index f88cf4fe66de875d643da8f20a639096f91e57d2,d3c0972852bda416006afab8b6e4d16458e2cc2c..d80933e18e576b922bc561c7527ef1394b82e9f7
--- 1/CMakeLists.txt
--- 2/CMakeLists.txt
+++ b/CMakeLists.txt
@@@ -3,9 -3,10 +3,10 @@@
  #
  
  cmake_minimum_required(VERSION 2.8.8)
+ cmake_policy(SET CMP0022 OLD)
  
  project(libjpeg-turbo C)
 -set(VERSION 1.3.1)
 +set(VERSION 1.3.80)
  
  if(MINGW OR CYGWIN)
    execute_process(COMMAND "date" "+%Y%m%d" OUTPUT_VARIABLE BUILD)