fix compil errors and fix make distcheck

[linphone] / oRTP

diff --git a/oRTP b/oRTP
index a4e50eedc1d6b6f8855d1c600b56b116e95c5060..5b231b8e0b9d82ccb93463ef4c2c28e15d68ba76 160000 (submodule)
--- a/oRTP
+++ b/oRTP
@@ -1 +1 @@
-Subproject commit a4e50eedc1d6b6f8855d1c600b56b116e95c5060
+Subproject commit 5b231b8e0b9d82ccb93463ef4c2c28e15d68ba76