Logging: Tag the entries in the merged log

So we know which entry is from the app and which is from the network
extension.

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/Shared/Logging/ringlogger.h

@@ -24,7 +24,7 @@ struct log {
 };
 
 void write_msg_to_log(struct log *log, const char *msg);
-int write_logs_to_file(const char *file_name, const struct log *log1, const struct log *log2);
+int write_logs_to_file(const char *file_name, const char *tag1, const struct log *log1, const char *tag2, const struct log *log2);
 struct log *open_log(const char *file_name);
 
 #endif