stmhal/moduselect: Move to extmod/ for reuse by other ports.
diff --git a/py/objmodule.c b/py/objmodule.c
index 9b06e3b..6f7d35d 100644
--- a/py/objmodule.c
+++ b/py/objmodule.c
@@ -198,6 +198,9 @@
 #if MICROPY_PY_URANDOM
     { MP_ROM_QSTR(MP_QSTR_urandom), MP_ROM_PTR(&mp_module_urandom) },
 #endif
+#if MICROPY_PY_USELECT
+    { MP_ROM_QSTR(MP_QSTR_uselect), MP_ROM_PTR(&mp_module_uselect) },
+#endif
 #if MICROPY_PY_USSL
     { MP_ROM_QSTR(MP_QSTR_ussl), MP_ROM_PTR(&mp_module_ussl) },
 #endif