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

include/libremidi/backends/alsa_raw/config.hpp

@@ -2,6 +2,7 @@
 #include <libremidi/config.hpp>
 
 #include <chrono>
+#include <cstdint>
 #include <functional>
 #include <optional>
 #include <span>
@@ -9,12 +10,12 @@
 
 #if __has_include(<poll.h>)
   #include <poll.h>
-namespace libremidi
+NAMESPACE_LIBREMIDI
 {
 using poll_descriptors = pollfd;
 }
 #else
-namespace libremidi
+NAMESPACE_LIBREMIDI
 {
 struct poll_descriptors
 {
@@ -25,7 +26,7 @@ struct poll_descriptors
 }
 #endif
 
-namespace libremidi
+NAMESPACE_LIBREMIDI
 {
 
 /**