Use more recent C-API functions on tear-down of the embedding code.

Cython/Utility/Embed.c

@@ -58,7 +58,12 @@ static int __Pyx_main(int argc, wchar_t **argv) {
       }
       Py_XDECREF(m);
     }
+#if PY_VERSION_HEX < 0x03060000
     Py_Finalize();
+#else
+    if (Py_FinalizeEx() < 0)
+        return 2;
+#endif
     return 0;
 }
 
@@ -200,7 +205,11 @@ int
         if (res == 0)
             res = __Pyx_main(argc, argv_copy);
         for (i = 0; i < argc; i++) {
+#if PY_VERSION_HEX < 0x03050000
             free(argv_copy2[i]);
+#else
+            PyMem_RawFree(argv_copy2[i]);
+#endif
         }
         free(argv_copy);
         free(argv_copy2);