Add Windows support to Export Validator

tools/export-validator/build.rs

@@ -1,4 +1,7 @@
-use std::{env, path::PathBuf};
+use std::{
+    env, fs,
+    path::{Path, PathBuf},
+};
 
 fn main() -> anyhow::Result<()> {
     let manifest_dir = env::var("CARGO_MANIFEST_DIR")?;
@@ -7,6 +10,9 @@ fn main() -> anyhow::Result<()> {
     libs_dir.push("lib3mf");
     libs_dir.push("libs");
 
+    let out_dir = env::var("OUT_DIR")?;
+    let out_dir = Path::new(&out_dir);
+
     // This is necessary to link against the dynamic library.
     println!("cargo:rustc-link-search=native={}", libs_dir.display());
     println!("cargo:rustc-link-lib=dylib=3mf");
@@ -15,6 +21,12 @@ fn main() -> anyhow::Result<()> {
     if cfg!(target_family = "unix") {
         println!("cargo:rustc-link-arg=-Wl,-rpath,{}", libs_dir.display());
     }
+    if cfg!(target_family = "windows") {
+        fs::copy(
+            libs_dir.join("3mf.dll"),
+            out_dir.join("../../../deps/3mf.dll"),
+        )?;
+    }
 
     Ok(())
 }