libremidi update to v5.4.3 and added virtual midi out as default

include/libremidi/backends/winuwp/helpers.hpp

@@ -7,13 +7,14 @@
 #include <string>
 #include <thread>
 #include <vector>
+#include <unknwn.h>
 
 #include <winrt/Windows.Devices.Enumeration.h>
 #include <winrt/Windows.Devices.Midi.h>
 #include <winrt/Windows.Foundation.h>
 #include <winrt/Windows.Storage.Streams.h>
 
-namespace libremidi
+NAMESPACE_LIBREMIDI
 {
 inline void winrt_init()
 {
@@ -23,8 +24,6 @@ inline void winrt_init()
   // winrt::init_apartment();
 }
 
-namespace
-{
 using namespace winrt;
 using namespace winrt::Windows::Foundation;
 using namespace winrt::Windows::Devices::Midi;
@@ -36,7 +35,7 @@ using namespace winrt::Windows::Storage::Streams;
 // get() function from winrt is that we avoid an assertion if waiting
 // from the STA thread.
 template <typename T>
-auto get(T const& async)
+LIBREMIDI_STATIC auto get(T const& async)
 {
   if (async.Status() != AsyncStatus::Completed)
   {
@@ -60,4 +59,3 @@ auto get(T const& async)
   return async.GetResults();
 }
 }
-}