core: add missing ctor/dtor

src/core/network/socket.cpp

@@ -337,6 +337,11 @@ SocketSet::SocketSet()
 #endif
 }
 
+SocketSet::~SocketSet()
+{
+	// Do nothing.
+}
+
 SocketSet &SocketSet::operator=(const SocketSet &other)
 {
 	_priv->fdset = other._priv->fdset;

src/core/network/socket.h

@@ -144,6 +144,12 @@ struct SocketSet
 	///
 	SocketSet();
 
+	///
+	~SocketSet();
+
+	///
+	SocketSet(const SocketSet &) = delete;
+
 	///
 	SocketSet &operator=(const SocketSet &other);