Add meshlink_channel_open_ex().

[meshlink] / src / utcp

diff --git a/src/utcp b/src/utcp
index a7ec88e641e14ca115fece6d1ea0e6c43144853f..5ded633782709710c42648c71154d6062e83b7a6 160000 (submodule)
--- a/src/utcp
+++ b/src/utcp
@@ -1 +1 @@
-Subproject commit a7ec88e641e14ca115fece6d1ea0e6c43144853f
+Subproject commit 5ded633782709710c42648c71154d6062e83b7a6