Addded desc_struct to opaque list due to it being packed and aligned

Author: TheDan64

build.rs

@@ -38,6 +38,7 @@ const OPAQUE_TYPES: &[&str] = &[
     // This needs to be opaque because it's both packed and aligned, which rustc
     // doesn't support yet. See https://github.com/rust-lang/rust/issues/59154
     // and https://github.com/rust-lang/rust-bindgen/issues/1538
+    "desc_struct",
     "xregs_state",
 ];