fix compilation issue

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index 4b8d2b655acc8a329464e7806653dceb04ade445..5a7ae95e0dbe5f485086d4635a655c893c9c44b1 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 4b8d2b655acc8a329464e7806653dceb04ade445
+Subproject commit 5a7ae95e0dbe5f485086d4635a655c893c9c44b1