fix ms2 compilation issue

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index abb47bc01fadac3e943d9d4a9cfb55993ca0e609..da89da8f938e658ef713511e2ff653bce4b7d423 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit abb47bc01fadac3e943d9d4a9cfb55993ca0e609
+Subproject commit da89da8f938e658ef713511e2ff653bce4b7d423