gcc 4.8 stl_bind test workaround

Author: jagerman

tests/test_stl_binders.cpp

@@ -49,7 +49,7 @@ template <class Container> Container *one_to_n(int n) {
 template <class Map> Map *times_ten(int n) {
     auto m = new Map();
     for (int i = 1; i <= n; i++)
-        m->emplace(i, 10*i);
+        m->emplace(int(i), E_nc(10*i));
     return m;
 }