update ms2 for SILK

diff --git a/mediastreamer2 b/mediastreamer2
index 00dfc7dd6aab93dcc9b81527370842b38fc3987d..c97cd5f2274ff0b8f74a1e5bc9b5467bd6e41f52 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 00dfc7dd6aab93dcc9b81527370842b38fc3987d
+Subproject commit c97cd5f2274ff0b8f74a1e5bc9b5467bd6e41f52