Import UTCP as a git submodule.

[meshlink] / src / utcp

diff --git a/src/utcp b/src/utcp
new file mode 160000 (submodule)
index 0000000..6934880
--- /dev/null
+++ b/src/utcp
@@ -0,0 +1 @@
+Subproject commit 6934880365c13cfebe5806be0f40c4c45a5dcf84