This fixes #5918.

* Change int64 json encoding to be string for php and ruby

* Fix ruby test

* Sync upb change

New bundler doesn't work with old gem: https://github.com/rbenv/rbenv/issues/1138

As a followup to ca3ead77, treat plugin executables as well as protoc as host tools.

This fixes compatibility with bazel when passing `--incompatible_no_support_tools_in_action_inputs` which will be flipped in an upcoming release.

Fix JavaLite version

Update protobuf version to 3.8.0

Fix gulpfile to use gulp 4 API

Previously, foo_value and foo (wrapper field) will both have get/setFooValue

Cherrypick 014872a9 to fix build

This reverts commit a7180caf.

This reverts commit 783971e8.
Revert an accidental revert!

This reverts commit 6d96493b.

This reverts commit c40018e5.

Make sure to include zlib.BUILD in our distribution

* Custom mktime to fix issue on mac

* Remove succeeded tests from failure list

Fix update_version script to use the appropriate rc style for C#

Update change log for 3.8.0

Remove unused files from lite's pom.xml

Update version to 3.8.0

Down integrate to GitHub

Down Integration to GitHub