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libccrtp was depending on commoncpp2, and have been replaced by a version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/libccrtp/sources/demo/audiorx.cpp b/jni/libccrtp/sources/demo/audiorx.cpp
index 1edd86e..0eb1ae0 100644
--- a/jni/libccrtp/sources/demo/audiorx.cpp
+++ b/jni/libccrtp/sources/demo/audiorx.cpp
@@ -32,11 +32,10 @@
 // In order to use ccRTP, the RTP stack of CommonC++, you only need to
 // include ...
 #include <ccrtp/rtp.h>
+#include <fcntl.h>
 
-#ifdef  CCXX_NAMESPACES
-using namespace ost;
+using namespace COMMONCPP_NAMESPACE;
 using namespace std;
-#endif
 
 /**
  * @class ccRTP_AudioReceiver
@@ -118,7 +117,6 @@
         // This will be useful for periodic execution.
         TimerPort::setTimer(PERIOD);
 
-        setCancel(cancelImmediate);
         // This is the main loop, where packets are sent and receipt.
         socket->setPayloadFormat(StaticPayloadFormat(sptPCMU));
         for( int i=0 ; true ; i++ ) {