message: More CMake policies
diff: ## limitations under the License. ##
  ## ======================================================================== ##
  -set(CMAKE_DISABLE_SOURCE_CHANGES ON)
  -set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
  -
  -PROJECT(OSPRay)
  +SET(CMAKE_DISABLE_SOURCE_CHANGES ON)
  +SET(CMAKE_DISABLE_IN_SOURCE_BUILD ON)
  CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
  CMAKE_POLICY(SET CMP0003 NEW) # since 2.6
  @@ -30,9 +28,17 @@ ENDIF()
  IF(POLICY CMP0042)
  CMAKE_POLICY(SET CMP0042 NEW) # since 3.0
  ENDIF()
  +IF(POLICY CMP0048)
  + CMAKE_POLICY(SET CMP0048 OLD) # since 3.0
  +ENDIF()
  IF(POLICY CMP0054)
  CMAKE_POLICY(SET CMP0054 OLD) # since 3.1
  ENDIF()
  +IF(POLICY CMP0074)
  + CMAKE_POLICY(SET CMP0074 NEW) # since 3.12
  +ENDIF()
  +
  +PROJECT(OSPRay)
  # configure directories for components we are going to include
  SET(OSPRAY_DIR ${CMAKE_CURRENT_SOURCE_DIR})
  