[CMake] Add SYSTEM info to INCLUDE_DIRECTORIES macro

This option avoid warnings comming from dependencies

CMakeLists.txt

@@ -70,12 +70,12 @@ ADD_REQUIRED_DEPENDENCY("eigen3 >= 3.0.5")
 SET(BOOST_COMPONENTS python)
 SEARCH_FOR_BOOST()
 # Add Boost path to include directories.
-INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS})
+INCLUDE_DIRECTORIES(SYSTEM ${Boost_INCLUDE_DIRS})
 
 FINDPYTHON(2.7 EXACT REQUIRED)
-INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIRS})
+INCLUDE_DIRECTORIES(SYSTEM ${PYTHON_INCLUDE_DIRS})
 FIND_NUMPY()
-INCLUDE_DIRECTORIES(${NUMPY_INCLUDE_DIRS})
+INCLUDE_DIRECTORIES(SYSTEM ${NUMPY_INCLUDE_DIRS})
 
 # ----------------------------------------------------
 # --- INCLUDE ----------------------------------------