Log Message:
Update tre to version 0.7.6:

A huge thankyou to Ville Laurikari for changing the license on tre to
be a two clause BSD license:

        Version 0.7.6
          - The license is changed from LGPL to a BSD-style license.  The new
            license is essentially the same as the "2 clause" BSD-style
            license used in NetBSD.  See the file LICENSE for details.

          - No longer using gnulib due to potential license conflicts.

          - Bug fixes.

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