[Bug 2364276] Review Request: rust-nng-c-sys - Bindings nng C library

https://bugzilla.redhat.com/show_bug.cgi?id=2364276

--- Comment #3 from Ben Beasley  ---
Note that when adjusting a -sys library to use the external/system copy of a
library it normally bundles, it’s a good idea to also patch it
(downstream-only) so that bindgen is a non-optional dependency and binding
re-generation happens unconditionally (here, governed by the build-bindgen
feature). You can still have the feature, but it shouldn’t actually control
anything anymore. That makes sure that we don’t have issues with bindings that
were based on the bundled version rather than the system version of the wrapped
library.