std: move leftover Windows error test

Author: joboet

library/std/src/sys/io/error/windows.rs

@@ -1,6 +1,9 @@
 use crate::sys::pal::{api, c};
 use crate::{io, ptr};
 
+#[cfg(test)]
+mod tests;
+
 pub fn errno() -> i32 {
     api::get_last_error().code as i32
 }

…rary/std/src/sys/pal/windows/os/tests.rs …ry/std/src/sys/io/error/windows/tests.rslibrary/std/src/sys/pal/windows/os/tests.rs renamed to library/std/src/sys/io/error/windows/tests.rs library/std/src/sys/pal/windows/os/tests.rs renamed to library/std/src/sys/io/error/windows/tests.rs

@@ -1,5 +1,5 @@
 use crate::io::Error;
-use crate::sys::c;
+use crate::sys::pal::c;
 
 // tests `error_string` above
 #[test]