Skip select ebadf test under WSLv1 due to a WSL bug

WSLv1 won't return EBADF (or any error) if the fd was closed mid-select.

src/fd_monitor.rs

@@ -384,6 +384,8 @@ impl BackgroundFdMonitor {
             // in particular it may even close file descriptors that we are waiting on. That is why
             // we handle EBADF. Note that even if the file descriptor is recycled, we don't invoke
             // a callback for it unless its ItemID is still present.
+            //
+            // Note that WSLv1 doesn't throw EBADF if the fd is closed is mid-select.
             drop(data);
             let ret = fds.check_readable(
                 timeout

src/tests/fd_monitor.rs

@@ -204,13 +204,18 @@ where
 
 #[test]
 fn test_close_during_select_ebadf() {
+    use crate::common::{is_windows_subsystem_for_linux as is_wsl, WSL};
     let close_it = |read_fd: OwnedFd| {
         drop(read_fd);
         None
     };
     let result = do_something_bad_during_select(close_it);
+
+    // WSLv1 does not error out with EBADF if the fd is closed mid-select.
+    // This is OK because we do not _depend_ on this behavior; the only
+    // true requirement is that we don't panic in the handling code above.
     assert!(
-        matches!(result, Err(libc::EBADF) | Ok(1)),
+        is_wsl(WSL::V1) || matches!(result, Err(libc::EBADF) | Ok(1)),
         "select/poll should have failed with EBADF or marked readable"
     );
 }