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libccrtp was depending on commoncpp2, and have been replaced by a version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/libucommon/sources/test/stdcpp.cpp b/jni/libucommon/sources/test/stdcpp.cpp
new file mode 100644
index 0000000..4c751e7
--- /dev/null
+++ b/jni/libucommon/sources/test/stdcpp.cpp
@@ -0,0 +1,40 @@
+// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.
+//
+// This file is part of GNU uCommon.
+//
+// GNU uCommon C++ is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU uCommon C++ is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with GNU uCommon C++.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef DEBUG
+#define DEBUG
+#endif
+
+#include <ucommon/ucommon.h>
+
+#include <iostream>
+#include <cstdio>
+
+using namespace UCOMMON_NAMESPACE;
+
+static string testing("second test");
+
+int main()
+{
+    char buff[33];
+    string::fill(buff, 32, ' ');
+    stringbuf<128> mystr;
+    mystr = (string)"hello" + (string)" this is a test";
+    std::cout << "STARTING " << *mystr << std::endl;
+    std::cout << "SECOND " << *testing << std::endl;
+    std::cout << "AN OFFET " << mystr(-10) << std::endl;
+};