Prevent accidentally copy/move of refcounted objects

src/util/pointer.h

@@ -273,9 +273,7 @@ public:
 	void grab() noexcept { ++m_refcount; }
 	void drop() noexcept { if (--m_refcount == 0) delete this; }
 
-	// Preserve own reference count.
-	IntrusiveReferenceCounted(const IntrusiveReferenceCounted &) {}
-	IntrusiveReferenceCounted &operator=(const IntrusiveReferenceCounted &) { return *this; }
+	DISABLE_CLASS_COPY(IntrusiveReferenceCounted)
 private:
 	u32 m_refcount = 1;
 };