Fixed compiler error on ubuntu 16.04

tools/imglab/CMakeLists.txt

@@ -9,6 +9,7 @@ cmake_minimum_required(VERSION 2.8.4)
 set (target_name imglab)
 
 PROJECT(${target_name})
+include(../../dlib/cmake)
 
 # add all the cpp files we want to compile to this list.  This tells
 # cmake that they are part of our target (which is the executable named imglab)
@@ -29,7 +30,6 @@ ADD_EXECUTABLE(${target_name}
 
 
 # Tell cmake to link our target executable to dlib.  
-include(../../dlib/cmake)
 TARGET_LINK_LIBRARIES(${target_name} dlib )