Upgrade rust/crates/nix to 0.20.0
Test: make
Change-Id: I2020fddab043f90e5a9d1c761215899ff566510a
diff --git a/src/pty.rs b/src/pty.rs
index 3a6a923..d67518f 100644
--- a/src/pty.rs
+++ b/src/pty.rs
@@ -43,7 +43,7 @@
/// While this datatype is a thin wrapper around `RawFd`, it enforces that the available PTY
/// functions are given the correct file descriptor. Additionally this type implements `Drop`,
/// so that when it's consumed or goes out of scope, it's automatically cleaned-up.
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Debug, Eq, Hash, PartialEq)]
pub struct PtyMaster(RawFd);
impl AsRawFd for PtyMaster {