build: add missing header file

GitLab: #630
Change-Id: If4aece97b8c2e63d63981a36bafb35523c01d3a6

src/ice_transport.cpp

@@ -23,6 +23,9 @@
 #include "transport/peer_channel.h"
 #include "tracepoint/tracepoint.h"
 
+#if __has_include(<fmt/std.h>)
+#include <fmt/std.h>
+#endif
 #include <opendht/logger.h>
 #include <opendht/utils.h>