rust_binder: Fix build failure if !CONFIG_COMPAT

The bindgen utility cannot handle "#define compat_ptr_ioctl NULL" in the
C header, so we need to handle this case on our own.

Simply skip this field in the initializer when !CONFIG_COMPAT as the
SAFETY comment above this initializer implies this is allowed.

Reported-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Closes: https://lore.kernel.org/all/CANiq72mrVzqXnAV=Hy2XBOonLHA6YQgH-ckZoc_h0VBvTGK8rA@mail.gmail.com/
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>

Author: xry111

drivers/android/binder/rust_binder_main.rs

@@ -314,6 +314,7 @@ pub static rust_binder_fops: AssertSync<kernel::bindings::file_operations> = {
         owner: THIS_MODULE.as_ptr(),
         poll: Some(rust_binder_poll),
         unlocked_ioctl: Some(rust_binder_ioctl),
+        #[cfg(CONFIG_COMPAT)]
         compat_ioctl: Some(bindings::compat_ptr_ioctl),
         mmap: Some(rust_binder_mmap),
         open: Some(rust_binder_open),