py/parsenum: Optimise when building with complex disabled.

To reduce code size when MICROPY_PY_BUILTINS_COMPLEX is disabled.

Signed-off-by: Damien George <damien@micropython.org>

py/objcomplex.c

@@ -83,7 +83,7 @@ STATIC mp_obj_t complex_make_new(const mp_obj_type_t *type_in, size_t n_args, si
                 // a string, parse it
                 size_t l;
                 const char *s = mp_obj_str_get_data(args[0], &l);
-                return mp_parse_num_decimal(s, l, true, true, NULL);
+                return mp_parse_num_complex(s, l, NULL);
             } else if (mp_obj_is_type(args[0], &mp_type_complex)) {
                 // a complex, just return it
                 return args[0];