Use is-terminal instead of atty.

Following up on #3696, use the new is-terminal crate to test for a tty
rather than having platform-specific logic in Wasmtime. The is-terminal
crate has a platform-independent API which takes a handle.

This also updates the tree to cap-std 0.24 etc., to avoid depending on
multiple versions of io-lifetimes at once, as enforced by the cargo deny
check.

crates/wasi-common/cap-std-sync/src/file.rs

@@ -1,5 +1,6 @@
 use cap_fs_ext::MetadataExt;
 use fs_set_times::{SetTimes, SystemTimeSpec};
+use is_terminal::IsTerminal;
 use std::any::Any;
 use std::convert::TryInto;
 use std::io;
@@ -125,14 +126,7 @@ impl WasiFile for File {
         Ok(self.0.num_ready_bytes()?)
     }
     fn isatty(&self) -> bool {
-        #[cfg(unix)]
-        {
-            rustix::io::isatty(&self.0)
-        }
-        #[cfg(windows)]
-        {
-            false
-        }
+        self.0.is_terminal()
     }
     async fn readable(&self) -> Result<(), Error> {
         Err(Error::badf())

crates/wasi-common/cap-std-sync/src/stdio.rs

@@ -1,6 +1,7 @@
 use crate::file::convert_systimespec;
 use fs_set_times::SetTimes;
 use io_lifetimes::AsFilelike;
+use is_terminal::IsTerminal;
 use std::any::Any;
 use std::convert::TryInto;
 use std::fs::File;
@@ -111,14 +112,7 @@ impl WasiFile for Stdin {
         Ok(self.0.num_ready_bytes()?)
     }
     fn isatty(&self) -> bool {
-        #[cfg(unix)]
-        {
-            rustix::io::isatty(&self.0)
-        }
-        #[cfg(not(unix))]
-        {
-            atty::is(atty::Stream::Stdin)
-        }
+        self.0.is_terminal()
     }
     async fn readable(&self) -> Result<(), Error> {
         Err(Error::badf())
@@ -242,14 +236,7 @@ macro_rules! wasi_file_write_impl {
                 Ok(0)
             }
             fn isatty(&self) -> bool {
-                #[cfg(unix)]
-                {
-                    rustix::io::isatty(&self.0)
-                }
-                #[cfg(not(unix))]
-                {
-                    atty::is(atty::Stream::$ident)
-                }
+                self.0.is_terminal()
             }
             async fn readable(&self) -> Result<(), Error> {
                 Err(Error::badf())