Cleanup cmake output a little.

dlib/CMakeLists.txt

@@ -7,7 +7,6 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(dlib)
 
-message(STATUS "Using CMake version: ${CMAKE_VERSION}")
 
 include(cmake_utils/set_compiler_specific_options.cmake)
 
@@ -123,6 +122,7 @@ endif()
 # once.  This most often happens when the top level of a project depends on two
 # or more other things which both depend on dlib. 
 if (NOT TARGET dlib)
+   message(STATUS "Using CMake version: ${CMAKE_VERSION}")
 
    set (DLIB_ISO_CPP_ONLY_STR 
       "Enable this if you don't want to compile any non-ISO C++ code (i.e. you don't use any of the API Wrappers)" )