Function hyper_clientconn_options_exec 

#[unsafe(no_mangle)]
pub extern "C" fn hyper_clientconn_options_exec(
    opts: *mut hyper_clientconn_options,
    exec: *const hyper_executor,
)

Available on crate feature ffi and hyper_unstable_ffi only.

Set the client background task executor.

This does not consume the options or the exec.