* win32/win32.c (rb_w32_select_with_thread): rounding up the fraction of
  tv_usec instead of rounding down.
  this change is an experiment to get rid of failures on vc10-x64 CI.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42793 b2dd03c8-39d4-4d8f-98ff-823fe69b080e