updated pjsip stack
There is still a bug on incoming calls when buiding for android
diff --git a/jni/pjproject-android/pjlib/src/pjlib-test/string.c b/jni/pjproject-android/pjlib/src/pjlib-test/string.c
index b7f73b9..5a5c394 100644
--- a/jni/pjproject-android/pjlib/src/pjlib-test/string.c
+++ b/jni/pjproject-android/pjlib/src/pjlib-test/string.c
@@ -1,4 +1,4 @@
-/* $Id: string.c 3553 2011-05-05 06:14:19Z nanang $ */
+/* $Id$ */
 /* 
  * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
  * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>