add unicode compatible file_lock for Windows

boost::interprocess::file_lock cannot open the files that contain characters which cannot be parsed by the user's code page on Windows.
This commit add a new class to handle those specific file for Windows.

test/lint/lint-includes.sh

@@ -57,7 +57,6 @@ EXPECTED_BOOST_INCLUDES=(
     boost/filesystem.hpp
     boost/filesystem/detail/utf8_codecvt_facet.hpp
     boost/filesystem/fstream.hpp
-    boost/interprocess/sync/file_lock.hpp
     boost/multi_index/hashed_index.hpp
     boost/multi_index/ordered_index.hpp
     boost/multi_index/sequenced_index.hpp