Add missing cfg

Author: newpavlov

src/shims/unix/fd.rs

@@ -38,6 +38,7 @@ pub trait FileDescription: std::fmt::Debug + Any {
 
     /// Reads as much as possible into the given buffer from a given offset,
     /// and returns the number of bytes read.
+    #[cfg(unix)]
     fn pread<'tcx>(
         &mut self,
         _communicate_allowed: bool,
@@ -50,6 +51,7 @@ pub trait FileDescription: std::fmt::Debug + Any {
 
     /// Writes as much as possible from the given buffer starting at a given offset,
     /// and returns the number of bytes written.
+    #[cfg(unix)]
     fn pwrite<'tcx>(
         &mut self,
         _communicate_allowed: bool,
@@ -488,6 +490,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         this.try_unwrap_io_result(result)
     }
 
+    #[cfg(unix)]
     fn pread(
         &mut self,
         fd: i32,
@@ -556,6 +559,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
         }
     }
 
+    #[cfg(unix)]
     fn pwrite(
         &mut self,
         fd: i32,