update mediastreamer2 for enabling plugin on macosx

diff --git a/mediastreamer2 b/mediastreamer2
index 5c2fe943251c5af493d18133251abf91e0ce5e83..92316f7a8793fe30e0d111d4b9043b76dcb8e726 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 5c2fe943251c5af493d18133251abf91e0ce5e83
+Subproject commit 92316f7a8793fe30e0d111d4b9043b76dcb8e726