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libccrtp was depending on commoncpp2, and have been replaced by a version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/nossl/hmac.cpp b/jni/libucommon/sources/nossl/hmac.cpp
new file mode 100644
index 0000000..4181eaf
--- /dev/null
+++ b/jni/libucommon/sources/nossl/hmac.cpp
@@ -0,0 +1,50 @@
+// Copyright (C) 2010 David Sugar, Tycho Softworks.
+//
+// This file is part of GNU uCommon C++.
+//
+// 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/>.
+
+#include "local.h"
+
+bool HMAC::has(const char *id)
+{
+    return false;
+}
+
+void HMAC::set(const char *digest, const char *key, size_t len)
+{
+    release();
+}
+
+void HMAC::release(void)
+{
+    bufsize = 0;
+    textbuf[0] = 0;
+
+    hmactype = " ";
+}
+
+bool HMAC::put(const void *address, size_t size)
+{
+    return false;
+}
+
+const unsigned char *HMAC::get(void)
+{
+    if(bufsize)
+        return buffer;
+
+    return NULL;
+}
+