make cpp won't compile since it requires `-std=c++11` com

Signed-off-by: Asra Ali <asraa@google.com>

@haberman

Cleanup various bits of Google.Protobuf

Fix latest ArgumentException for C# extensions

* Add php 7.4 to docker image

* Use https links

* Add a proto_lang_toolchain for javalite

* fix toolchain. Swap javalite example to master repo

Fix conformance test failures for Google.Protobuf

This reverts commit f0680052.

Remove add_proto_enumdesc and get_proto_enumdesc

* Implement lazy loading of php class for proto messages

* Fix php 7.1

* Fix encode

* Fix memory leak

* Fix enum descriptor

* Update CHANGES.txt with 3.11.0-RC1 release notes (#6909)

* Revert "Make shared libraries be able to link to MSVC static runtime libraries, so that VC runtime is not required." (#6914)

* Marked update_compatibility_version.py as executable (#6916)

Remove IsInitialized checks accidentally left in MessageParser
Simplify ExtensionCollection.CrossLink

* Make reserve names map persistent

* Add DescriptorInternal to map

* Use get_msgdef_desc in encode_decode.c

* Add persistent map for ce=>def and enum=>def

* Replace get_ce_obj

* Remove get_proto_obj

* Remove obsolete fields from Descriptor and EnumDescriptor

* Add cache for descriptor php values

* Add cache for descriptors

* Fix bug

* Avoid add generated file again if it has been added

* Fix the bug upb depends on null-ended str for look up.

* Initialize generated pool impl

* Turn down old generated pool

* Add init entry flag protobuf.keep_descriptor_pool_after_request

By default, it's off. Add protobuf.keep_descriptor_pool_after_request=1 to php.ini to enable it

* Fix zts build

* Update Xcode version needed to run Kokoro tests

* Replace deprecated --no-ri --no-rdoc rubygem options with --no-document

* Register additional handlers from wrappers

* Return zval instead of parse frame

* Use parse frame

* Update upb

* Lazily create wrapper messages

* Fix a segment fault

Need check type of field before getting submsg def

* Avoid expanding during serialization and direct access

* Fix a bug that getXXXUnwrapped returns null for string

* Implement writeWrapperUnwrapped

* Add more tests

* Fix oneof wrapper parsing

* Fix get oneof field

* Avoid expansion for oneof wrappers

* Fix bug

* Fix a bug that in php7 variable is defined out of scope

* Fix broken tests
 * Update upb to fix Timestamp conformance tests
 * Fix segmentation fault for oneof wrapper fields

* Fix encoding/decoding top level wrapper values

* Add type checking for write wrapper value in php7

* Fix zts build

* Fix the bug that readWrapperValue uses parent message's layout to access wrapper value

* Fix wrapper in map

This reverts commit 0c8acb6c.

* upgrade dotnet SDK

* upgrade dotnet SDK version in global.json

Fixes https://github.com/protocolbuffers/protobuf/issues/5335.