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libccrtp was depending on commoncpp2, and have been replaced by a version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/common/osSpecifics.h b/jni/libzrtp/sources/common/osSpecifics.h
index 5030688..494dc0a 100644
--- a/jni/libzrtp/sources/common/osSpecifics.h
+++ b/jni/libzrtp/sources/common/osSpecifics.h
@@ -1,8 +1,8 @@
 /*
-  Copyright (C) 2012-2013 Werner Dittmann
+  Copyright (C) 2012 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.
 
@@ -34,23 +34,6 @@
  * @author Werner Dittmann <Werner.Dittmann@t-online.de>
  */
 
-#ifndef __EXPORT
-  #if (defined _WIN32 || defined __CYGWIN__) && defined(_DLL)
-    #define __EXPORT    __declspec(dllimport)
-    #define __LOCAL
-  #elif __GNUC__ >= 4
-    #define __EXPORT    __attribute__ ((visibility("default")))
-    #define __LOCAL     __attribute__ ((visibility("hidden")))
-  #else
-    #define __EXPORT
-    #define __LOCAL
-  #endif
-#endif
-
-#if defined(_WIN32) || defined(_WIN64)
-# define snprintf _snprintf
-#endif
-
 #if defined(__cplusplus)
 extern "C"
 {