Fix libjingle compilation with mediastreamer >= 2.9.x

Library mediastreamer in 2.9.x changed API, see:
http://lists.nongnu.org/archive/html/linphone-users/2013-04/msg00052.html

With this patch there is support for both old (< 2.9)
and new (>= 2.9) mediastreamer versions.

BUG: 318825
FIXED-IN: 4.12