fix windows issues

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tun2proxy"
-version = "1.0.0"
+version = "0.4.0"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/blechschmidt/tun2proxy"

build.rs

@@ -5,8 +5,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         use std::io::Write;
         f.write_all(format!("CARGO_TARGET_DIR: '{}'\r\n", cargo_target_dir.display()).as_bytes())?;
 
-        // The wintun crate's root directory
-        let crate_dir = get_crate_dir("wintun")?;
+        // The wintun-bindings crate's root directory
+        let crate_dir = get_crate_dir("wintun-bindings")?;
 
         // The path to the DLL file, relative to the crate root, depending on the target architecture
         let dll_path = get_wintun_bin_relative_path()?;