changed test to avoid compiler error in gcc 4.8

dlib/test/multithreaded_object.cpp

@@ -183,7 +183,9 @@ namespace
             DLIB_TEST(is_running() == false);
         }
 
-        ~test4_c2() throw (std::exception)
+        ~test4_c2() 
+        {
+            try
             {
                 DLIB_TEST(number_of_threads_registered() == 2);
                 DLIB_TEST(number_of_threads_alive() == 2);
@@ -196,6 +198,12 @@ namespace
                 DLIB_TEST(number_of_threads_alive() == 0);
                 DLIB_TEST(is_running() == false);
             }
+            catch(std::exception& e)
+            {
+                std::cerr << e.what() << std::endl;
+                exit(1);
+            }
+        }
 
     private: