[Boost-maint] [date_time] Fix Boost.Sync tests

Subject: [Boost-maint] [date_time] Fix Boost.Sync tests
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2014-05-31 09:19:27

Hi,

With a recent commit to Boost.DateTime:

https://github.com/boostorg/date_time/commit/6636f49f13154555b3b9c9618fca5f03cf47a5b3

some essential typedefs were removed, which caused Boost.Sync test failures. 
Please apply this pull request to fix it:

https://github.com/boostorg/date_time/pull/12