Explicitly set windres target, fixing i686 builds from amd64

Closes #34

src/windows_not_msvc.rs

@@ -1,5 +1,6 @@
 use std::process::Command;
 use std::path::PathBuf;
+use std::env;
 
 
 #[derive(Debug, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
@@ -19,7 +20,15 @@ impl ResourceCompiler {
 
     pub fn compile_resource(&self, out_dir: &str, prefix: &str, resource: &str) {
         let out_file = format!("{}/lib{}.a", out_dir, prefix);
-        match Command::new("windres").args(&["--input", resource, "--output-format=coff", "--output", &out_file, "--include-dir", out_dir]).status() {
+        let target = if env::var("TARGET").expect("No TARGET env var").starts_with("x86_64") {
+            "pe-x86-64" // Default for amd64 windres
+        } else {
+            "pe-i386" // This is wrong for ARM Windows, but I couldn't find a triple for it (if it exists at all)
+        };
+
+        match Command::new("windres")
+            .args(&["--input", resource, "--output-format=coff", "--target", target, "--output", &out_file, "--include-dir", out_dir])
+            .status() {
             Ok(stat) if stat.success() => {}
             Ok(stat) => panic!("windres failed to compile \"{}\" into \"{}\" with {}", resource, out_file, stat),
             Err(e) => panic!("Couldn't to execute windres to compile \"{}\" into \"{}\": {}", resource, out_file, e),