ringaccount: include cinttypes

Change-Id: Ic06371032cf701da53456fb551921b89b07efc9e
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>

src/ringdht/ringaccount.cpp

@@ -80,6 +80,7 @@
 #include <memory>
 #include <sstream>
 #include <cctype>
+#include <cinttypes>
 #include <cstdarg>
 #include <string>
 #include <system_error>