Rollup merge of rust-lang#128539 - biabbas:deny_unsafe, r=workingjubilee

Forbid unused unsafe in vxworks-specific std modules

Tracking issue rust-lang#127747
Adding deny(unsafe_op_in_unsafe_fn) in VxWorks specific files did not cause any error.
Most of VxWorks falls back on Unix libraries. So we'll have to wait for Unix changes.

r? ```@workingjubilee```

std/src/os/vxworks/mod.rs

@@ -1,6 +1,7 @@
 //! VxWorks-specific definitions
 
 #![stable(feature = "raw_ext", since = "1.1.0")]
+#![forbid(unsafe_op_in_unsafe_fn)]
 
 pub mod fs;
 pub mod raw;

std/src/sys/pal/unix/process/process_vxworks.rs

@@ -1,3 +1,4 @@
+#![forbid(unsafe_op_in_unsafe_fn)]
 use libc::{self, c_char, c_int, RTP_ID};
 
 use crate::io::{self, ErrorKind};