add armv7s support for IOS

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index bc1d91a891a04858b43d6e08fa1136d2c3b9c6a2..02dc872f0f85986b7691b4ac911da7825f185a3e 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit bc1d91a891a04858b43d6e08fa1136d2c3b9c6a2
+Subproject commit 02dc872f0f85986b7691b4ac911da7825f185a3e