Upgrade rust/crates/protobuf to 2.16.2

* Update local file out/version.rs to new cargo output.
* Keep local change of src/lib.rs that includes out/version.rs.

Test: make
Change-Id: I535c121ed1bd49d638e70ee88d12661e0b918eaa
diff --git a/src/rt.rs b/src/rt.rs
index 312bb4f..b50b71d 100644
--- a/src/rt.rs
+++ b/src/rt.rs
@@ -30,6 +30,7 @@
 use zigzag::*;
 
 use unknown::UnknownFields;
+pub use crate::lazy_v2::LazyV2;
 
 /// Given `u64` value compute varint encoded length.
 pub fn compute_raw_varint64_size(value: u64) -> u32 {