fix: import Dev and FileType on Apple targets

The use declarations for Dev and FileType were gated with
cfg(not(apple)), causing compilation failures when mknodat became
available on Apple. Remove apple from the exclusion list.

Author: mattsu2020

src/backend/libc/fs/syscalls.rs

@@ -52,7 +52,6 @@ use crate::fs::StatFs;
 #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
 use crate::fs::Timestamps;
 #[cfg(not(any(
-    apple,
     target_os = "espidf",
     target_os = "redox",
     target_os = "vita",

src/fs/at.rs

@@ -20,7 +20,7 @@ use crate::fs::CloneFlags;
 use crate::fs::RenameFlags;
 #[cfg(not(target_os = "espidf"))]
 use crate::fs::Stat;
-#[cfg(not(any(apple, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
+#[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "wasi")))]
 use crate::fs::{Dev, FileType};
 #[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
 use crate::fs::{Gid, Uid};