Disable the futex deprecation for now. (#1138)

There are significant numbers of users using `futex`, so don't deprecate
the old API for now.

Author: sunfishcode

src/backend/libc/thread/futex.rs

@@ -51,13 +51,16 @@ pub(crate) enum Operation {
 /// `FUTEX_*` operations for use with the [`futex`] function.
 ///
 /// [`futex`]: fn@crate::thread::futex
+// TODO: Deprecate this now that we have a new typed API.
+/*
 #[deprecated(
     since = "0.38.35",
     note = "
     The `futex` function and `FutexOperation` enum are deprecated. There are
     individual functions available to perform futex operations with improved
     type safety. See the `rustix::thread::futex` module."
 )]
+*/
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 #[repr(u32)]
 pub enum FutexOperation {

src/backend/linux_raw/thread/futex.rs

@@ -53,13 +53,16 @@ pub(crate) enum Operation {
 /// `FUTEX_*` operations for use with the [`futex`] function.
 ///
 /// [`futex`]: fn@crate::thread::futex
+// TODO: Deprecate this now that we have a new typed API.
+/*
 #[deprecated(
     since = "0.38.35",
     note = "
     The `futex` function and `FutexOperation` enum are deprecated. There are
     individual functions available to perform futex operations with improved
     type safety. See the `rustix::thread::futex` module."
 )]
+*/
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 #[repr(u32)]
 pub enum FutexOperation {