update joda-time javadoc url

Note that the default behavior is still to throw an exception; you
need to opt into ignoring unknown fields.

Fixes #2838.

Suppress VS2017 compiler/linker warnings

* Reserve unknown in ruby

* Revert ruby tests. Wait for cpp impl for conformance test

* Add conformance test for preserving unknown

* Add unknown field conformance test to csharp failure list.

* Fix comments

* Fix comment

* Fix comments

* Fix typo

* Use stringsink_string directly

* Mark hd unused

* Remove unused encodeunknown_handlerfunc

Merge 3.4.x into master before cutting 3.5.x

To be clear that we set a new variable

Improves coverage of GPBCodedInputStream

Add brief documentation describing each warning suppression.

[v3.4.x branch] Fix iOS cc_library build for protobuf.

Fix iOS cc_library build for protobuf.

CodedInputStream::SetTotalBytesLimit description fix

fix implicit fallthrough in gcc 7

Integrate google internal changes for the up coming 3.5 release.

fixes issue #3750

Add @Deprecated annotation support for proto file.

Add the proto-lens Haskell library to the 3rd party doc.

protobuf_generate: create include path only for proto files

Clang warning cleanup for unused parameter.

Add GopherJS protobuf and gRPC links

Fix: Truncated Message due to "TypeError: unhashable type: 'bytearray'"

Remove C++11 only usages in io_win32 tests.

Fix undefined memory management found by Clang's sanitizers.

See https://github.com/google/protobuf/issues/3752 for context.

The SDK and os versions were hard coded.  Archs were mixed up.
Because of this,  Was getting errors with latest SDK:
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/' [-Wmissing-sysroot]
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/' [-Wmissing-sysroot]
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/' [-Wmissing-sysroot]
In file included from external/com_google_protobuf/src/google/protobuf/io/printer.cc:35:
In file included from external/com_google_protobuf/src/google/protobuf/io/printer.h:40:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string:470:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string_view:171:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__string:56:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:638:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstring:61:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string.h:61:15: fatal error: 'string.h' file not found
              ^~~~~~~~~~
              1 error generated.

Currently none of these are needed when using bazel with https://github.com/bazelbuild/rules_apple.
-target arm64-apple-ios is passed properly to clang.  So -arch armv7 etc are not needed.
OS_IOS is not used anywhere.
Sources have:  GOOGLE_PROTOBUF_NO_THREADLOCAL defined in src/google/protobuf/stubs/platform_macros.h for iOS.  So __thread= is not needed.  In fact now that bazel is using C++11 by default,  __thread should ideally be moved to thread_local.
-miphoneos-version-min is passed by rules_apple.

The SDK and os versions were hard coded.  Archs were mixed up.
Because of this,  Was getting errors with latest SDK:
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/' [-Wmissing-sysroot]
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/' [-Wmissing-sysroot]
clang: warning: no such sysroot directory: '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/' [-Wmissing-sysroot]
In file included from external/com_google_protobuf/src/google/protobuf/io/printer.cc:35:
In file included from external/com_google_protobuf/src/google/protobuf/io/printer.h:40:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string:470:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string_view:171:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__string:56:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:638:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cstring:61:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/string.h:61:15: fatal error: 'string.h' file not found
              ^~~~~~~~~~
              1 error generated.

Currently none of these are needed when using bazel with https://github.com/bazelbuild/rules_apple.
-target arm64-apple-ios is passed properly to clang.  So -arch armv7 etc are not needed.
OS_IOS is not used anywhere.
Sources have:  GOOGLE_PROTOBUF_NO_THREADLOCAL defined in src/google/protobuf/stubs/platform_macros.h for iOS.  So __thread= is not needed.  In fact now that bazel is using C++11 by default,  __thread should ideally be moved to thread_local.
-miphoneos-version-min is passed by rules_apple.

fixes #3700