Added desc_struct to opaque list

Author: TheDan64

build.rs

@@ -34,12 +34,13 @@ const INCLUDED_VARS: &[&str] = &[
     "KERN_INFO",
     "VERIFY_WRITE",
 ];
-/// The xregs_state struct must be opaque because it is both packed
+/// These structs must be opaque because they're both packed
 /// and aligned, which is not yet supported by rust. See
 /// https://github.com/rust-lang/rust/issues/59154 and
 /// https://github.com/rust-lang/rust-bindgen/issues/1538
 const OPAQUE_TYPES: &[&str] = &[
     "^xregs_state$",
+    "^desc_struct$",
 ];
 
 fn main() {