Fix m4

[linphone] / oRTP

diff --git a/oRTP b/oRTP
index 1b449a3491fb2397df129467bf58a64921d65e40..36ebc75f7dfef4f4a2b63df61a040211e7c7f6c8 160000 (submodule)
--- a/oRTP
+++ b/oRTP
@@ -1 +1 @@
-Subproject commit 1b449a3491fb2397df129467bf58a64921d65e40
+Subproject commit 36ebc75f7dfef4f4a2b63df61a040211e7c7f6c8