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libccrtp was depending on commoncpp2, and have been replaced by a version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/random.cpp b/jni/libucommon/sources/nossl/random.cpp
new file mode 100644
index 0000000..6815ee7
--- /dev/null
+++ b/jni/libucommon/sources/nossl/random.cpp
@@ -0,0 +1,108 @@
+// 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"
+
+#ifndef _MSWINDOWS_
+#include <fcntl.h>
+#endif
+
+void Random::seed(void)
+{
+    time_t now;
+
+    time(&now);
+    srand((int)now);
+}
+
+bool Random::seed(const unsigned char *buf, size_t size)
+{
+#ifdef  _MSWINDOWS_
+    return false;
+#else
+    int fd = open("/dev/random", O_WRONLY);
+    bool result = false;
+
+    if(fd > -1) {
+        if(write(fd, buf, size) > 0)
+            result = true;
+        close(fd);
+    }
+    return result;
+#endif
+}
+
+size_t Random::key(unsigned char *buf, size_t size)
+{
+#ifdef  _MSWINDOWS_
+    if((_handle != (HCRYPTPROV)NULL) && CryptGenRandom(_handle, size, buf))
+        return size;
+    return 0;
+#else
+    int fd = open("/dev/random", O_RDONLY);
+    ssize_t result = 0;
+
+    if(fd > -1) {
+        result = read(fd, buf, size);
+        close(fd);
+    }
+
+    if(result < 0)
+        result = 0;
+
+    return (size_t)result;
+#endif
+}
+
+size_t Random::fill(unsigned char *buf, size_t size)
+{
+#ifdef  _MSWINDOWS_
+    return key(buf, size);
+#else
+    int fd = open("/dev/urandom", O_RDONLY);
+    ssize_t result = 0;
+
+    if(fd > -1) {
+        result = read(fd, buf, size);
+        close(fd);
+    }
+    // ugly...would not trust it
+    else {
+        result = 0;
+        while(result++ < (ssize_t)size)
+            *(buf++) = rand() & 0xff;
+    }
+
+    if(result < 0)
+        result = 0;
+
+    return (size_t)result;
+#endif
+}
+
+bool Random::status(void)
+{
+#ifdef  _MSWINDOWS_
+    return true;
+#else
+    if(fsys::is_file("/dev/random"))
+        return true;
+
+    return false;
+#endif
+}
+