tail: Fix random errors mainly on macos for piped input. Treat resolved paths to /dev/fd/0 as pipe.

Closes #3953

src/uu/tail/src/paths.rs

@@ -75,7 +75,10 @@ impl Input {
             }
             InputKind::File(_) | InputKind::Stdin => {
                 if cfg!(unix) {
-                    PathBuf::from(text::DEV_STDIN).canonicalize().ok()
+                    match PathBuf::from(text::DEV_STDIN).canonicalize().ok() {
+                        Some(path) if path != PathBuf::from(text::FD0) => Some(path),
+                        Some(_) | None => None,
+                    }
                 } else {
                     None
                 }

src/uu/tail/src/text.rs

@@ -18,3 +18,4 @@ pub static BACKEND: &str = "inotify";
 pub static BACKEND: &str = "kqueue";
 #[cfg(target_os = "windows")]
 pub static BACKEND: &str = "ReadDirectoryChanges";
+pub static FD0: &str = "/dev/fd/0";