Add conditional compilation to lib.rs for iconv-sys

Author: curtisalexander

crates/iconv-sys/build.rs

@@ -76,6 +76,7 @@ fn main() {
         .expect("Couldn't write bindings!");
 }
 
+// no-op for not windows as not needed
 #[cfg(not(windows))]
 fn main() {
     ()

crates/iconv-sys/src/lib.rs

@@ -5,4 +5,6 @@
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
 
+// Only needed for Windows
+#[cfg(windows)]
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));