STYLE: In CMakeLists.txt, change the syntax related to CMake_Policy

CMakeLists.txt

@@ -1,7 +1,10 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
-IF(COMMAND CMAKE_POLICY)
-  CMAKE_POLICY(SET CMP0003 NEW)
-ENDIF(COMMAND CMAKE_POLICY)
+
+FOREACH(policy CMP0003)
+  IF(POLICY ${policy})
+    CMAKE_POLICY(SET ${policy} NEW)
+  ENDIF()
+ENDFOREACH()
 
 PROJECT(CTK)