Switch commoncpp2 to ucommon to solve dependency conflicts.

libccrtp was depending on commoncpp2, and have been replaced by a version
depending on ucommon as well.
diff --git a/jni/libzrtp/sources/zrtp/libzrtpcpp/ZrtpStateClass.h b/jni/libzrtp/sources/zrtp/libzrtpcpp/ZrtpStateClass.h
index 5c16313..c1887c9 100644
--- a/jni/libzrtp/sources/zrtp/libzrtpcpp/ZrtpStateClass.h
+++ b/jni/libzrtp/sources/zrtp/libzrtpcpp/ZrtpStateClass.h
@@ -1,8 +1,8 @@
 /*
-  Copyright (C) 2006-2013 Werner Dittmann
+  Copyright (C) 2006-2010 Werner Dittmann
 
   This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU Lesser General Public License as published by
+  it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
@@ -161,11 +161,6 @@
      */
     bool subEvWaitRelayAck();
 
-    /**
-     * Hello packet version sent to other partner
-     */
-    int32_t sentVersion;
-
 public:
     /// Create a ZrtpStateClass
     ZrtpStateClass(ZRtp *p);