protobuf: Upgrade 3.11.4 -> 3.12.3

Upgrade to release 3.12.3. Update the path to the git repository
in GitHub. Update the patch for examples/Makefile.

The new release brings:

- [experimental] Singular, non-message typed fields in proto3 now
  support presence tracking. This is enabled by adding the
  "optional" field label and passing the
  --experimental_allow_proto3_optional flag to protoc.
- Allow duplicate symbol names when multiple descriptor sets are
  passed on the command-line, to match the behavior when multiple
  .proto files are passed.
- Deterministic protoc --descriptor_set_out
- Bug fixes for the supported programming languages

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/protobuf/protobuf/0001-examples-Makefile-respect-CXX-LDFLAGS-variables-fix-.patch

@@ -1,4 +1,4 @@
-From a28e15092a298e0c73c6fc1ded0913275cf27cb0 Mon Sep 17 00:00:00 2001
+From e5340f816aa273cfda36998466739ca0748caafb Mon Sep 17 00:00:00 2001
 From: Martin Jansa <Martin.Jansa@gmail.com>
 Date: Fri, 28 Jun 2019 13:50:52 +0000
 Subject: [PATCH] examples/Makefile: respect CXX,LDFLAGS variables, fix build
@@ -23,12 +23,13 @@ Subject: [PATCH] examples/Makefile: respect CXX,LDFLAGS variables, fix build
 
 Upstream-Status: Pending
 Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
+Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
 ---
  examples/Makefile | 6 ++++--
  1 file changed, 4 insertions(+), 2 deletions(-)
 
 diff --git a/examples/Makefile b/examples/Makefile
-index 4ad605641..31d887639 100644
+index e9f9635ae..b2fbe2de1 100644
 --- a/examples/Makefile
 +++ b/examples/Makefile
 @@ -2,6 +2,8 @@
@@ -44,13 +45,16 @@ index 4ad605641..31d887639 100644
  
  add_person_cpp: add_person.cc protoc_middleman
  	pkg-config --cflags protobuf  # fails if protobuf is not installed
--	c++ add_person.cc addressbook.pb.cc -o add_person_cpp `pkg-config --cflags --libs protobuf`
+-	c++ -std=c++11 add_person.cc addressbook.pb.cc -o add_person_cpp `pkg-config --cflags --libs protobuf`
 +	$(CXX) $(CXXFLAGS) $(LDFLAGS) ../src/google/protobuf/.libs/timestamp.pb.o $(PROTOBUF) add_person.cc addressbook.pb.cc -o add_person_cpp
  
  list_people_cpp: list_people.cc protoc_middleman
  	pkg-config --cflags protobuf  # fails if protobuf is not installed
--	c++ list_people.cc addressbook.pb.cc -o list_people_cpp `pkg-config --cflags --libs protobuf`
+-	c++ -std=c++11 list_people.cc addressbook.pb.cc -o list_people_cpp `pkg-config --cflags --libs protobuf`
 +	$(CXX) $(CXXFLAGS) $(LDFLAGS) ../src/google/protobuf/.libs/timestamp.pb.o $(PROTOBUF) list_people.cc addressbook.pb.cc -o list_people_cpp
  
  add_person_dart: add_person.dart protoc_middleman_dart
  
+-- 
+2.17.1
+

meta-oe/recipes-devtools/protobuf/protobuf_3.12.3.bb

@@ -10,9 +10,9 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=37b5762e07f0af8c74ce80a8bda4266b"
 DEPENDS = "zlib"
 DEPENDS_append_class-target = " protobuf-native"
 
-SRCREV = "d0bfd5221182da1a7cc280f3337b5e41a89539cf"
+SRCREV = "31ebe2ac71400344a5db91ffc13c4ddfb7589f92"
 
-SRC_URI = "git://github.com/google/protobuf.git;branch=3.11.x \
+SRC_URI = "git://github.com/protocolbuffers/protobuf.git \
            file://run-ptest \
            file://0001-protobuf-fix-configure-error.patch \
            file://0001-Makefile.am-include-descriptor.cc-when-building-libp.patch \