Revert "move cfg determining if specialized version is used out of pal"

tidy does not allow target_os = "something" in src/thread/mod

This reverts commit 525cbbb.

Author: dvdsk

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

@@ -86,6 +86,14 @@ 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) {
         unsafe {
             let _ = hermit_abi::join(self.tid);

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

@@ -205,6 +205,14 @@ 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) {
         // Safety: `ThreadInner` is alive at this point
         let inner = unsafe { self.p_inner.as_ref() };

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

@@ -132,6 +132,14 @@ impl Thread {
         usercalls::wait_timeout(0, dur, || true);
     }
 
+    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.wait();
     }

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

@@ -296,6 +296,27 @@ impl Thread {
         }
     }
 
+    #[cfg(not(any(
+        target_vendor = "apple",
+        target_os = "freebsd",
+        target_os = "netbsd",
+        target_os = "linux",
+        target_os = "android",
+        target_os = "solaris",
+        target_os = "illumos",
+        target_os = "dragonfly",
+        target_os = "hurd",
+        target_os = "fuchsia",
+        target_os = "vxworks",
+    )))]
+    pub fn sleep_until(deadline: Instant) {
+        let now = Instant::now();
+
+        if let Some(delay) = deadline.checked_duration_since(now) {
+            sleep(delay);
+        }
+    }
+
     // Note depends on clock_nanosleep (not supported on os's by apple)
     #[cfg(any(
         target_os = "freebsd",

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

@@ -171,6 +171,14 @@ 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) {
         cfg_if::cfg_if! {
             if #[cfg(target_feature = "atomics")] {

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

@@ -8,7 +8,7 @@ use crate::os::windows::io::{AsRawHandle, HandleOrNull};
 use crate::sys::handle::Handle;
 use crate::sys::{c, stack_overflow};
 use crate::sys_common::FromInner;
-use crate::time::Duration;
+use crate::time::{Duration, Instant};
 use crate::{io, ptr};
 
 pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
@@ -106,6 +106,14 @@ impl Thread {
         }
     }
 
+    pub fn sleep_until(deadline: Instant) {
+        let now = Instant::now();
+
+        if let Some(delay) = deadline.checked_duration_since(now) {
+            Self::sleep(delay);
+        }
+    }
+
     pub fn handle(&self) -> &Handle {
         &self.handle
     }

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

@@ -128,6 +128,14 @@ 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) {
         join_thread(self.tid).unwrap();
     }

library/std/src/thread/mod.rs

@@ -985,44 +985,6 @@ pub fn sleep(dur: Duration) {
 /// ```
 #[unstable(feature = "thread_sleep_until", issue = "113752")]
 pub fn sleep_until(deadline: Instant) {
-    impl_sleep_until(deadline)
-}
-
-#[cfg(not(any(
-    target_os = "freebsd",
-    target_os = "netbsd",
-    target_os = "linux",
-    target_os = "android",
-    target_os = "solaris",
-    target_os = "illumos",
-    target_os = "dragonfly",
-    target_os = "hurd",
-    target_os = "fuchsia",
-    target_os = "vxworks",
-)))]
-#[inline]
-fn impl_sleep_until(deadline: Instant) {
-    let now = Instant::now();
-
-    if let Some(delay) = deadline.checked_duration_since(now) {
-        sleep(delay);
-    }
-}
-
-#[cfg(any(
-    target_os = "freebsd",
-    target_os = "netbsd",
-    target_os = "linux",
-    target_os = "android",
-    target_os = "solaris",
-    target_os = "illumos",
-    target_os = "dragonfly",
-    target_os = "hurd",
-    target_os = "fuchsia",
-    target_os = "vxworks",
-))]
-#[inline]
-fn impl_sleep_until(deadline: Instant) {
     imp::Thread::sleep_until(deadline)
 }