Made the stack trace code a little cleaner

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402332

dlib/stack_trace.cpp

@@ -69,7 +69,7 @@ namespace dlib
         while (get_dlib_stack_trace_stack().data().move_next())
         {
             stack_tracer_data data = get_dlib_stack_trace_stack().data().element();
-            sout << data.file_name << ":" << data.line_number << "\n    " << data.funct_name;
+            sout << data.file_name << ":" << data.line_number << "\n    " << data.funct_name << "\n";
         }
         return sout.str();
     }

dlib/stack_trace.h

@@ -54,7 +54,10 @@
 
 // only setup the stack trace stuff if the asserts are enabled (which happens in debug mode
 // basically).  Also, this stuff doesn't work if you use NO_MAKEFILE
-#if defined(DLIB_ENABLE_STACK_TRACE) && !defined(NO_MAKEFILE)
+#if defined(DLIB_ENABLE_STACK_TRACE) 
+#ifdef NO_MAKEFILE 
+#error "You can't use the dlib stack trace stuff and NO_MAKEFILE at the same time"
+#endif
 
 namespace dlib
 {