aarch64: fix unit tests inside logger
The definition of mkfifo function inside
rust-lang is:
"pub fn mkfifo(path: *const c_char, mode: mode_t) -> ::c_int;"
Use that instead of `const i8` for the first arg.
//! use self::tempfile::NamedTempFile;
//! use std::ops::Deref;
//!
+//! use libc::c_char;
+//!
//! #[macro_use]
//! extern crate logger;
//! use logger::{AppInfo, LOGGER};
//! let metrics = String::from(metrics_file_temp.path().to_path_buf().to_str().unwrap());
//!
//! unsafe {
-//! libc::mkfifo(logs.as_bytes().as_ptr() as *const i8, 0o644);
+//! libc::mkfifo(logs.as_bytes().as_ptr() as *const c_char, 0o644);
//! }
//! unsafe {
-//! libc::mkfifo(metrics.as_bytes().as_ptr() as *const i8, 0o644);
+//! libc::mkfifo(metrics.as_bytes().as_ptr() as *const c_char, 0o644);
//! }
//! // Initialize the logger to log to a FIFO that was created beforehand.
//! assert!(LOGGER.deref().init(
