Added a missing scope resolution statement.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402237

dlib/stack_trace.h

@@ -72,7 +72,7 @@ namespace dlib
         dlib__out << "Error occurred in function " << DLIB_FUNCTION_NAME << ".\n\n";      \
         dlib__out << "Failing expression was " << #_exp << ".\n";           \
         dlib__out << _message << "\n\n";                                      \
-        dlib__out << "Stack Trace: \n" << get_stack_trace() << "\n";        \
+        dlib__out << "Stack Trace: \n" << dlib::get_stack_trace() << "\n";        \
         dlib_assert_breakpoint();                                           \
         throw dlib::fatal_error(dlib::EBROKEN_ASSERT,dlib__out.str());      \
     }}