add major/minor/makedev on apple OSes

Author: SteveLauC

src/unix/bsd/apple/mod.rs

@@ -4976,6 +4976,18 @@ f! {
     pub {const} fn VM_MAKE_TAG(id: u8) -> u32 {
         (id as u32) << 24u32
     }
+
+    pub fn major(dev: dev_t) -> i32 {
+        (dev >> 24) & 0xff
+    }
+
+    pub fn minor(dev: dev_t) -> i32 {
+        dev & 0xffffff
+    }
+
+    pub fn makedev(major: i32, minor: i32) -> dev_t {
+        (major << 24) | minor
+    }
 }
 
 safe_f! {