Rollup merge of #82712 - CDirkx:cfg-target_os, r=dtolnay

Remove unnecessary conditional `cfg(target_os)` for `redox` and `vxworks`

`redox` and `vxworks` are now part of target_family `unix`, thus `cfg(unix)` already implies `cfg(target_os="redox")` and `cfg(target_os="vxworks")`

35dbef2350/compiler/rustc_target/src/spec/redox_base.rs (L26)

35dbef2350/compiler/rustc_target/src/spec/vxworks_base.rs (L27)

library/std/src/os/mod.rs

@@ -29,7 +29,7 @@ pub use crate::sys::wasi_ext as wasi;
 // If we're not documenting libstd then we just expose the main modules as we otherwise would.
 
 #[cfg(not(doc))]
-#[cfg(any(target_os = "redox", unix, target_os = "vxworks", target_os = "hermit"))]
+#[cfg(any(unix, target_os = "hermit"))]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use crate::sys::ext as unix;