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libccrtp was depending on commoncpp2, and have been replaced by a version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/hmac.cpp b/jni/libucommon/sources/openssl/hmac.cpp
new file mode 100644
index 0000000..8131ba3
--- /dev/null
+++ b/jni/libucommon/sources/openssl/hmac.cpp
@@ -0,0 +1,91 @@
+// 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 (EVP_get_digestbyname(id) != NULL);
+}
+
+void HMAC::set(const char *digest, const char *key, size_t len)
+{
+    secure::init();
+
+    release();
+
+    if(!len)
+        len = strlen(key);
+
+    hmactype = EVP_get_digestbyname(digest);
+    if(hmactype && len) {
+        context = new HMAC_CTX;
+        HMAC_CTX_init((HMAC_CTX *)context);
+        HMAC_Init((HMAC_CTX *)context, key, len, (const EVP_MD *)hmactype);
+    }
+}
+
+void HMAC::release(void)
+{
+    if(context)
+        HMAC_cleanup((HMAC_CTX *)context);
+
+    if(context) {
+        delete (HMAC_CTX *)context;
+        context = NULL;
+    }
+
+    bufsize = 0;
+    textbuf[0] = 0;
+}
+
+bool HMAC::put(const void *address, size_t size)
+{
+    if(!context)
+        return false;
+
+    HMAC_Update((HMAC_CTX *)context, (const unsigned char *)address, size);
+    return true;
+}
+
+const unsigned char *HMAC::get(void)
+{
+    unsigned count = 0;
+    unsigned size = 0;
+
+    if(bufsize)
+        return buffer;
+
+    if(!context)
+        return NULL;
+
+	HMAC_Final((HMAC_CTX *)context, buffer, &size);
+	release();
+
+	if(!size)
+		return NULL;
+
+    bufsize = size;
+
+    while(count < bufsize) {
+        snprintf(textbuf + (count * 2), 3, "%2.2x",
+buffer[count]);
+        ++count;
+    }
+    return buffer;
+}
+