Use \r\n on windows (#2698)

Author: pvdrz

bindgen/lib.rs

@@ -927,22 +927,24 @@ impl Bindings {
 
     /// Write these bindings as source text to the given `Write`able.
     pub fn write<'a>(&self, mut writer: Box<dyn Write + 'a>) -> io::Result<()> {
+        const NL: &str = if cfg!(windows) { "\r\n" } else { "\n" };
+
         if !self.options.disable_header_comment {
             let version =
                 option_env!("CARGO_PKG_VERSION").unwrap_or("(unknown version)");
-            let header = format!(
-                "/* automatically generated by rust-bindgen {version} */\n\n",
-            );
-            writer.write_all(header.as_bytes())?;
+            writeln!(
+                writer,
+                "/* automatically generated by rust-bindgen {version} */{NL}",
+            )?;
         }
 
         for line in self.options.raw_lines.iter() {
             writer.write_all(line.as_bytes())?;
-            writer.write_all("\n".as_bytes())?;
+            writer.write_all(NL.as_bytes())?;
         }
 
         if !self.options.raw_lines.is_empty() {
-            writer.write_all("\n".as_bytes())?;
+            writer.write_all(NL.as_bytes())?;
         }
 
         match self.format_tokens(&self.module) {