Log Message:
devel/protobuf and devel/py-protobuf updated to 3.5.1

2017-12-20 version 3.5.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
  Planned Future Changes
  * Make C++ implementation C++11 only: we plan to require C++11 to build
    protobuf code starting from 3.6.0 release. Please join this github issue:
    https://github.com/google/protobuf/issues/2780 to provide your feedback.

  protoc
  * Fixed a bug introduced in 3.5.0 and protoc in Windows now accepts non-ascii
    characters in paths again.

  C++
  * Removed several usages of C++11 features in the code base.
  * Fixed some compiler warnings.

  PHP
  * Fixed memory leak in C-extension implementation.
  * Added discardUnknokwnFields API.
  * Removed duplicatd typedef in C-extension headers.
  * Avoided calling private php methods (timelib_update_ts).
  * Fixed Any.php to use fully-qualified name for DescriptorPool.

  Ruby
  * Added Google_Protobuf_discard_unknown for discarding unknown fields in
    messages.

  C#
  * Unknown fields are now preserved by default.
  * Floating point values are now bitwise compared, affecting message equality
    check and Contains() API in map and repeated fields.