Use evaluate_with_error and allow certificate_at_index

Author: kazk

src/imp/security_framework.rs

@@ -428,8 +428,11 @@ impl<S: io::Read + io::Write> TlsStream<S> {
             Some(trust) => trust,
             None => return Ok(None),
         };
-        trust.evaluate()?;
+        trust.evaluate_with_error()?;
 
+        // `certificate_at_index` was deprecated by Apple.
+        // No replacement provided.
+        #[allow(deprecated)]
         Ok(trust.certificate_at_index(0).map(Certificate))
     }