zephyr-sys: Suppress bad links in bindgen doc comments

Avoid generating build warnings about things that look like links in
bindgen copied rustdocs.

The larger problem is that these are in a different syntax than rustdoc
comments, and will not be formatted nicely.

Signed-off-by: David Brown <david.brown@linaro.org>

Author: d3zd3z

zephyr-sys/src/lib.rs

@@ -18,6 +18,7 @@
 #![allow(improper_ctypes)]
 
 #![allow(rustdoc::broken_intra_doc_links)]
+#![allow(rustdoc::bare_urls)]
 
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));