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libccrtp was depending on commoncpp2, and have been replaced by a version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/openssl/random.cpp b/jni/libucommon/sources/openssl/random.cpp
new file mode 100644
index 0000000..85ccf90
--- /dev/null
+++ b/jni/libucommon/sources/openssl/random.cpp
@@ -0,0 +1,59 @@
+// 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"
+
+void Random::seed(void)
+{
+    secure::init();
+    RAND_poll();
+}
+
+bool Random::seed(const unsigned char *buf, size_t size)
+{
+    secure::init();
+
+    RAND_seed(buf, size);
+    return true;
+}
+
+size_t Random::key(unsigned char *buf, size_t size)
+{
+    secure::init();
+
+    if(RAND_bytes(buf, size))
+        return size;
+    return 0;
+}
+
+size_t Random::fill(unsigned char *buf, size_t size)
+{
+    secure::init();
+
+    if(RAND_pseudo_bytes(buf, size))
+        return size;
+    return 0;
+}
+
+bool Random::status(void)
+{
+    if(RAND_status())
+        return true;
+
+    return false;
+}
+