gcc 3.3 would sometimes cause this code to throw invalid_svm_nu_error

when it shouldn't.  This should now be fixed.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403692

dlib/svm/svm.h

@@ -1251,7 +1251,7 @@ namespace dlib
                     else 
                     {
                         has_slack = true;
-                        if (temp > num)
+                        if (num_total > num)
                         {
                             ++count;
                             alpha(i) = temp - std::floor(temp);
@@ -1282,7 +1282,7 @@ namespace dlib
                     else 
                     {
                         has_slack = true;
-                        if (temp > num)
+                        if (num_total > num)
                         {
                             ++count;
                             alpha(i) = temp - std::floor(temp);