Add icons to windows builds

build.rs

@@ -1,6 +1,12 @@
-use std::path::Path;
+use std::{error::Error, path::Path};
+
+fn main() -> Result<(), Box<dyn Error>> {
+    if std::env::var("CARGO_CFG_TARGET_OS")? == "windows" {
+        let mut res = winresource::WindowsResource::new();
+        res.set_icon("assets/lemur.ico");
+        res.compile()?;
+    }
 
-fn main() {
     println!("cargo::rerun-if-changed=shrooms-vb-core");
     cc::Build::new()
         .include(Path::new("shrooms-vb-core/core"))
@@ -11,4 +17,6 @@ fn main() {
         .define("VB_DIV_GENERIC", None)
         .file(Path::new("shrooms-vb-core/core/vb.c"))
         .compile("vb");
+
+    Ok(())
 }