Add setaffinity method to thread implementation and interface class

Foundation/include/Poco/Thread_POSIX.h

@@ -74,6 +74,7 @@ public:
 	static int getMaxOSPriorityImpl(int policy);
 	void setStackSizeImpl(int size);
 	int getStackSizeImpl() const;
+	void setAffinityImpl(unsigned int cpu);
 	void startImpl(SharedPtr<Runnable> pTarget);
 	void joinImpl();
 	bool joinImpl(long milliseconds);