libmedia: Add ICS audiotrack constructor

Change-Id: I5c1a3d1093cbf16111638a37601093c5eb977dd4
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 362d022..fa52fa9 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -733,6 +733,11 @@
     return mSessionId;
 }
 
+extern "C" int _ZNK7android10AudioTrack12getSessionIdEv();
+extern "C" int _ZN7android10AudioTrack12getSessionIdEv() {
+    return _ZNK7android10AudioTrack12getSessionIdEv();
+}
+
 status_t AudioTrack::attachAuxEffect(int effectId)
 {
     ALOGV("attachAuxEffect(%d)", effectId);