ANDROID: Disable warning about new bindgen

This warning makes sense upstream because users may not know how to
adjust bindgen flags to be compatible with new versions. We adjusted
these flags as needed when updating the bindgen prebuilt.

Bug: 348496478
Change-Id: I6d201971d83b08225e847881708d19c34b9e3040
Signed-off-by: Matthew Maurer <mmaurer@google.com>