fixed ifndef for Mex dependency

features/simplefeatures/progs/progCodebookRandomForest.cpp

@@ -5,6 +5,9 @@
   * @date 10/05/2014
   */
 
+#ifdef NICE_USELIB_MEX
+#ifdef NICE_USELIB_MATIO
+
 #include <string>
 #include <exception>
 #include <iostream>
@@ -389,3 +392,5 @@ int main(int argc, char **argv)
 
     return 0;
 }
+#endif //#ifdef NICE_USELIB_MATIO
+#endif