fix hermit

reregister is used by sourcefd, which is always available under os-ext,
so selectors should always provide reregister when os-ext is enabled
even if cfg(unix) fails

Author: Darksonn

src/sys/unix/selector/epoll.rs

@@ -82,7 +82,7 @@ impl Selector {
         syscall!(epoll_ctl(ep, libc::EPOLL_CTL_ADD, fd, &mut event)).map(|_| ())
     }
 
-    cfg_io_source! {
+    cfg_any_os_ext! {
     pub fn reregister(&self, fd: RawFd, token: Token, interests: Interest) -> io::Result<()> {
         let mut event = libc::epoll_event {
             events: interests_to_epoll(interests),

src/sys/unix/selector/kqueue.rs

@@ -165,7 +165,7 @@ impl Selector {
         kevent_register(self.kq.as_raw_fd(), changes, &[libc::EPIPE as i64])
     }
 
-    cfg_io_source! {
+    cfg_any_os_ext! {
     pub fn reregister(&self, fd: RawFd, token: Token, interests: Interest) -> io::Result<()> {
         let flags = libc::EV_CLEAR | libc::EV_RECEIPT;
         let write_flags = if interests.is_writable() {

src/sys/unix/selector/poll.rs

@@ -61,7 +61,7 @@ impl Selector {
         self.state.register_internal(fd, token, interests)
     }
 
-    cfg_io_source! {
+    cfg_any_os_ext! {
     pub fn reregister(&self, fd: RawFd, token: Token, interests: Interest) -> io::Result<()> {
         self.state.reregister(fd, token, interests)
     }
@@ -356,7 +356,7 @@ impl SelectorState {
         })
     }
 
-    cfg_io_source! {
+    cfg_any_os_ext! {
     pub fn reregister(&self, fd: RawFd, token: Token, interests: Interest) -> io::Result<()> {
         self.modify_fds(|fds| {
             let data = fds.fd_data.get_mut(&fd).ok_or(io::ErrorKind::NotFound)?;