Revert "add more default sleep_until to different pals"

This reverts commit 0285d33.

Author: dvdsk

library/std/src/sys/pal/hermit/thread.rs

@@ -4,7 +4,7 @@ use super::hermit_abi;
 use crate::ffi::CStr;
 use crate::mem::ManuallyDrop;
 use crate::num::NonZero;
-use crate::time::{Duration, Instant};
+use crate::time::Duration;
 use crate::{io, ptr};
 
 pub type Tid = hermit_abi::Tid;

library/std/src/sys/pal/sgx/thread.rs

@@ -5,7 +5,7 @@ use super::unsupported;
 use crate::ffi::CStr;
 use crate::io;
 use crate::num::NonZero;
-use crate::time::{Duration, Instant};
+use crate::time::Duration;
 
 pub struct Thread(task_queue::JoinHandle);
 

library/std/src/sys/pal/teeos/thread.rs

@@ -2,7 +2,7 @@ use crate::ffi::CStr;
 use crate::mem::{self, ManuallyDrop};
 use crate::num::NonZero;
 use crate::sys::os;
-use crate::time::{Duration, Instant};
+use crate::time::Duration;
 use crate::{cmp, io, ptr};
 
 pub const DEFAULT_MIN_STACK_SIZE: usize = 8 * 1024;
@@ -109,14 +109,6 @@ impl Thread {
         }
     }
 
-    pub fn sleep_until(deadline: Instant) {
-        let now = Instant::now();
-
-        if let Some(delay) = deadline.checked_duration_since(now) {
-            Self::sleep(delay);
-        }
-    }
-
     /// must join, because no pthread_detach supported
     pub fn join(self) {
         let id = self.into_id();

library/std/src/sys/pal/uefi/thread.rs

@@ -3,7 +3,7 @@ use crate::ffi::CStr;
 use crate::io;
 use crate::num::NonZero;
 use crate::ptr::NonNull;
-use crate::time::{Duration, Instant};
+use crate::time::Duration;
 
 pub struct Thread(!);
 
@@ -39,14 +39,6 @@ impl Thread {
         }
     }
 
-    pub fn sleep_until(deadline: Instant) {
-        let now = Instant::now();
-
-        if let Some(delay) = deadline.checked_duration_since(now) {
-            sleep(delay);
-        }
-    }
-
     pub fn join(self) {
         self.0
     }

library/std/src/sys/pal/unix/thread.rs

@@ -297,6 +297,7 @@ impl Thread {
     }
 
     #[cfg(not(any(
+        target_vendor = "apple",
         target_os = "freebsd",
         target_os = "netbsd",
         target_os = "linux",