modubinascii: Add, with hexlify() implementation.
diff --git a/py/mpconfig.h b/py/mpconfig.h
index f4f9986..4bd7bfe 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -439,6 +439,10 @@
 #define MICROPY_PY_UHASHLIB (0)
 #endif
 
+#ifndef MICROPY_PY_UBINASCII
+#define MICROPY_PY_UBINASCII (0)
+#endif
+
 /*****************************************************************************/
 /* Hooks for a port to add builtins                                          */