Revert "move libthread to libstb-hal"

This reverts commit 95ee7f9e98.

common/thread_abstraction.cpp

@@ -0,0 +1,34 @@
+#include "thread_abstraction.h"
+
+SimpleThread::SimpleThread() :
+	mIsRunning(false),
+	mThread()
+{
+}
+
+SimpleThread::~SimpleThread()
+{
+	// if thread is still running on object destruction, cancel thread the hard way:
+	if (mIsRunning)
+	{
+		pthread_cancel(mThread);
+	}
+}
+
+void SimpleThread::startThread()
+{
+	mIsRunning = true;
+	pthread_create(&mThread, 0, &SimpleThread::runThread, this);
+}
+
+void SimpleThread::joinThread()
+{
+	pthread_join(mThread, 0);
+	mIsRunning = false;
+}
+
+void* SimpleThread::runThread(void* ptr)
+{
+	static_cast<SimpleThread*>(ptr)->run();
+	return 0;
+}