Add SeekData and SeekHole to Whence for apple targets

Author: xzfc

changelog/2473.added.md

@@ -0,0 +1 @@
+Add `SeekData` and `SeekHole` to `Whence` for apple targets

src/unistd.rs

@@ -1426,6 +1426,7 @@ pub enum Whence {
     /// equal to offset that contains some data. If offset points to
     /// some data, then the file offset is set to offset.
     #[cfg(any(
+        apple_targets,
         freebsdlike,
         solarish,
         target_os = "linux",
@@ -1437,6 +1438,7 @@ pub enum Whence {
     /// then the file offset should be adjusted to the end of the file (i.e., there
     /// is an implicit hole at the end of any file).
     #[cfg(any(
+        apple_targets,
         freebsdlike,
         solarish,
         target_os = "linux",