another fix for old-style imports in Py3.3: only try relative imports from within a package

--HG--
extra : transplant_source : %DF7%9D%BC%D2%07%B6%92v5N%7E%D2%3B%9AJ%95d_%B3

Cython/Compiler/ExprNodes.py

@@ -9450,7 +9450,8 @@ static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, long level) {
     {
         #if PY_VERSION_HEX >= 0x03030000
         if (level == -1) {
-            /* try relative import first */
+            if (strchr(__Pyx_MODULE_NAME, '.')) {
+                /* try package relative import first */
                 PyObject *py_level = PyInt_FromLong(1);
                 if (!py_level)
                     goto bad;
@@ -9461,9 +9462,10 @@ static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, long level) {
                     if (!PyErr_ExceptionMatches(PyExc_ImportError))
                         goto bad;
                     PyErr_Clear();
-                level = 0; /* try absolute import on failure */
                 }
             }
+            level = 0; /* try absolute import on failure */
+        }
         #endif
         if (!module) {
             PyObject *py_level = PyInt_FromLong(level);