message: Use cmake's message() correctly
diff: @@ -18,7 +18,7 @@ function(visionaray_use_framework name)
  )
  if(${FRAMEWORK_${name}} STREQUAL FRAMEWORK_${name}-NOTFOUND)
  - message(ERROR ": Framework ${name} not found")
  + message(FATAL_ERROR ": Framework ${name} not found")
  else()
  set(__VSNRAY_LINK_LIBRARIES ${__VSNRAY_LINK_LIBRARIES} ${FRAMEWORK_${name}}/${name} PARENT_SCOPE)
  endif()
  