[protobuf] upgrade to latest release (v3.18.0) (#20208)

* [protobuf] upgrade to latest release (v3.18.0)

This requires patching OpenCV as it uses a function removed in the
latest version of protobuf (FWIW, upstream OpenCV has a similar patch).

* The arcus port also needs a patch

* The caffe2 port also needs a patch

* The brpc port also needs a patch

1 files changed, 13 insertions, 0 deletions

diff --git a/ports/brpc/fix-protobuf-deprecated.patch b/ports/brpc/fix-protobuf-deprecated.patch
new file mode 100644
index 000000000..564724c63
--- /dev/null
+++ b/ports/brpc/fix-protobuf-deprecated.patch
@@ -0,0 +1,13 @@
+diff --git a/src/brpc/protocol.cpp b/src/brpc/protocol.cpp
+index 11297ea..c998edb 100644
+--- a/src/brpc/protocol.cpp
++++ b/src/brpc/protocol.cpp
+@@ -203,7 +203,7 @@ BUTIL_FORCE_INLINE bool ParsePbFromZeroCopyStreamInlined(
+     // According to source code of pb, SetTotalBytesLimit is not a simple set,
+     // avoid calling the function when the limit is definitely unreached.
+     if (PB_TOTAL_BYETS_LIMITS < FLAGS_max_body_size) {
+-        decoder.SetTotalBytesLimit(INT_MAX, -1);
++        decoder.SetTotalBytesLimit(INT_MAX);
+     }
+     return msg->ParseFromCodedStream(&decoder) && decoder.ConsumedEntireMessage();
+ }