Made unit tests compile stuff in tools folder

dlib/test/CMakeLists.txt

@@ -180,6 +180,7 @@ TARGET_LINK_LIBRARIES(${target_name} dlib )
 if (NOT DLIB_NO_GUI_SUPPORT)
    add_subdirectory(gui)
    add_subdirectory(examples)
+   add_subdirectory(tools)
 endif()
 
 

dlib/test/tools/CMakeLists.txt

+cmake_minimum_required(VERSION 2.8.4)
+
+add_subdirectory(../../../tools/imglab imglab_build)
+add_subdirectory(../../../tools/htmlify htmlify_build)
+add_subdirectory(../../../tools/mltool mltool_build)