Add proper definition for regex_traits::_regex_word

[Albert Wong (王重傑)]

Hello,

I have a small patch to regex_traits for fixing some compile errors I ran
into building for MIPS Android.  I updated the patch to Phabricator per these
instructions <http://llvm.org/docs/Phabricator.html> but I have no clue who
to add as a reviewer.  The svn logs make it look like it should be
hhinnant, but Phabricator rejects Howard as a reviewer. :-/

Anyways, the patch is here:

  http://llvm-reviews.chandlerc.com/D492

It's a pretty simple 5 liner.

-Albert
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