Merge Phil Zimmermann's libzrtp as a FreeSWITCH library

Thanks to Phil Zimmermann for the code and for the license exception
we needed to include it.

There remains some build system integration work to be done before
this code will build properly in the FreeSWITCH tree.

libs/libzrtp/projects/symbian/DelayRuner.cpp

@@ -0,0 +1,79 @@
+/*
+ ============================================================================
+ Name		: CDelayRuner.cpp
+ Author	  : R. Drutsky
+ Version	 : 1.0
+ Copyright   : Copyright (c) 2010 Soft Industry
+ Description : CCDelayRuner implementation
+ ============================================================================
+ */
+
+#include "DelayRuner.h"
+#include "zrtp_iface_system.h"
+
+void zrtp_internal_delete_task_from_list(zrtp_stream_t* ctx, zrtp_retry_task_t* ztask);
+
+CDelayRuner::CDelayRuner() :
+	CActive(EPriorityLow) // Standard priority
+	{
+	}
+
+CDelayRuner* CDelayRuner::NewLC()
+	{
+	CDelayRuner* self = new (ELeave) CDelayRuner();
+	CleanupStack::PushL(self);
+	self->ConstructL();
+	return self;
+	}
+
+CDelayRuner* CDelayRuner::NewL()
+	{
+	CDelayRuner* self = CDelayRuner::NewLC();
+	CleanupStack::Pop(); // self;
+	return self;
+	}
+
+void CDelayRuner::ConstructL()
+	{
+	User::LeaveIfError(iTimer.CreateLocal()); // Initialize timer
+	CActiveScheduler::Add(this); // Add to scheduler
+	}
+
+CDelayRuner::~CDelayRuner()
+	{
+	Cancel(); // Cancel any request, if outstanding
+	iTimer.Close(); // Destroy the RTimer object
+	// Delete instance variables if any
+	}
+
+void CDelayRuner::DoCancel()
+	{
+	iTimer.Cancel();
+	}
+
+void CDelayRuner::StartL(zrtp_stream_t *ctx, zrtp_retry_task_t* ztask)
+	{
+	Cancel(); // Cancel any request, just to be sure
+	//iState = EUninitialized;
+	iCtx = ctx;
+	iZTask = ztask;
+	iTimer.After(iStatus, ztask->timeout * 1000); // Set for later
+	SetActive(); // Tell scheduler a request is active
+	}
+
+void CDelayRuner::RunL()
+	{
+	if (iStatus == KErrNone)
+		{
+		// Do something useful
+		iZTask->_is_busy = 1 ; // may be we don't need this
+		(iZTask->callback)(iCtx,iZTask);
+		iZTask->_is_busy = 0 ; // may be we don't need this
+		}
+	zrtp_internal_delete_task_from_list(iCtx,iZTask);
+	}
+
+TInt CDelayRuner::RunError(TInt aError)
+	{
+	return aError;
+	}