Always compile the C++11 related unit tests.

dlib/test/CMakeLists.txt

@@ -150,17 +150,11 @@ set (tests
    tuple.cpp
    type_safe_union.cpp
    vectorstream.cpp
-   )
-
-# Tests that require C++11 support
-if (COMPILER_CAN_DO_CPP_11)
-   set(tests ${tests}
    dnn.cpp
    cublas.cpp
    find_optimal_parameters.cpp
    elastic_net.cpp
    )
-endif()
 
 
 # add all the cpp files we want to compile to this list.  This tells