Update oRTP and mediastreamer2 submodules.

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index 8d85a5ded3b18e2d3d4ba22ee75e0f1ef9c0f739..b2ddf6ece0aede9c602cfb39d3f43f177c9dbf7e 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 8d85a5ded3b18e2d3d4ba22ee75e0f1ef9c0f739
+Subproject commit b2ddf6ece0aede9c602cfb39d3f43f177c9dbf7e