Removed C++11 check here since it's now redundant with the checks in algs.h. Also, the check

doesn't work correctly in visual studio since visual studio doesn't define __cplusplus
to 201103 even though the current version ostensibly supports C++11.

dlib/all/source.cpp

@@ -23,10 +23,9 @@
 #include "../data_io/mnist.cpp"
 
 // Stuff that requires C++11
-#if __cplusplus >= 201103
 #include "../dnn/cpu_dlib.cpp"
 #include "../dnn/tensor_tools.cpp"
-#endif 
+
 
 #ifndef DLIB_ISO_CPP_ONLY
 // Code that depends on OS specific APIs