Feature gate Unix-specific polling code

lib/wasi/src/state/types.rs

@@ -243,6 +243,7 @@ pub fn iterate_poll_events(pes: PollEventSet) -> PollEventIter {
     PollEventIter { pes, i: 0 }
 }
 
+#[cfg(unix)]
 fn poll_event_set_to_platform_poll_events(mut pes: PollEventSet) -> i16 {
     let mut out = 0;
     for i in 0..16 {
@@ -259,6 +260,7 @@ fn poll_event_set_to_platform_poll_events(mut pes: PollEventSet) -> i16 {
     out
 }
 
+#[cfg(unix)]
 fn platform_poll_events_to_pollevent_set(mut num: i16) -> PollEventSet {
     let mut peb = PollEventBuilder::new();
     for i in 0..16 {
@@ -324,9 +326,9 @@ pub(crate) fn poll(
 
 #[cfg(not(unix))]
 pub(crate) fn poll(
-    selfs: &[&dyn WasiFile],
-    events: &[PollEventSet],
-    seen_events: &mut [PollEventSet],
+    _selfs: &[&dyn WasiFile],
+    _events: &[PollEventSet],
+    _seen_events: &mut [PollEventSet],
 ) -> Result<(), WasiFsError> {
     unimplemented!("HostFile::poll in WasiFile is not implemented for non-Unix-like targets yet");
 }