message: Change `if cfg!(..) { }` to `#[cfg!(..)] { }`
  This fixes builds on non-Windows platforms.
diff: @@ -679,7 +679,8 @@ fn exclude_from_backups(path: &Path) {
  ///
  /// This is currently a no-op on non-Windows platforms.
  fn exclude_from_content_indexing(path: &Path) {
  - if cfg!(windows) {
  + #[cfg(windows)]
  + {
  use std::iter::once;
  use std::os::windows::prelude::OsStrExt;
  use winapi::um::fileapi::{GetFileAttributesW, SetFileAttributesW};
  @@ -692,7 +693,9 @@ fn exclude_from_content_indexing(path: &Path) {
  GetFileAttributesW(path.as_ptr()) | FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
  );
  }
  - } else {
  + }
  + #[cfg(not(windows))]
  + {
  let _ = path;
  }
  }
  