Just a simple package of C library syslog, which is convenient for us to use in the process of rewriting C code to Rust.

# Example
```
let ident = String::from("myprogram");
syslog_c::openlog(&ident, libc::LOG_CONS | libc::LOG_PID, libc::LOG_AUTHPRIV);
let file_name = String::from("null.txt");
let msg = format!("{} {}", "No this file", file_name);
syslog_c::syslog(libc::LOG_ERR, &msg);
```