Path::starts_with and ends_with should be case-insensitive on Windows


```rust
#[test]
fn test_path_starts_with() {
    let path = PathBuf::from(r"C:\A\b");
    assert!(path.starts_with(r"C:\a"));
}

#[test]
fn test_path_ends_with() {
    let path = PathBuf::from(r"C:\a\b");
    assert!(path.ends_with("B"));
}

```