TunBuilderCapture refactor: replace typedef with using

Cpp Core Guidelines T.43: Prefer using over typedef for defining aliases

Signed-off-by: Leonard Ossa <[email protected]>

openvpn/tun/builder/capture.hpp

@@ -41,7 +41,7 @@ namespace openvpn {
 class TunBuilderCapture : public TunBuilderBase, public RC<thread_unsafe_refcount>
 {
   public:
-    typedef RCPtr<TunBuilderCapture> Ptr;
+    using Ptr = RCPtr<TunBuilderCapture>;
 
     // builder data classes