py: Abstract no-return attribute for functions a bit.
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 13918e8..04d4a7d 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -230,3 +230,6 @@
 #define INT_FMT "%d"
 #endif
 #endif //INT_FMT
+
+// Modifier for function which doesn't return
+#define NORETURN __attribute__((noreturn))