fix(HostEntry): DNS HostEntry returns multiple entries #3303

Net/include/Poco/Net/HostEntry.h

@@ -76,6 +76,14 @@ public:
 		/// for the host.
 
 private:
+	template <typename C>
+	void removeDuplicates(C& list)
+	{
+		std::sort(list.begin(), list.end());
+		auto last = std::unique(list.begin(), list.end());
+		list.erase(last, list.end());
+	}
+
 	std::string _name;
 	AliasList   _aliases;
 	AddressList _addresses;