* src/libs/gnulib/*: Update `gnulib' files.

Because we currently don't support `gnulib-tool' directly but add
everything to the CVS repository, and many internal details of the
gnulib setup has changed, it is necessary to do redo the import.

. Temporarily rename `src/libs/gnulib' to `src/libs/gnulib.old'.

. Call

    gnulib-tool --create-testdir \
                --dir=src/libs/gnulib \
                wcwidth

. Manually move directories `src/libs/gnulib/gl{lib,m4}' to
  `src/libs/gnulib/{lib,m4}', and do `s/gllib/lib/' and `s/glm4/m4/'
  in all files to `convert' the gnulib testbed to a standard gnulib
  configuration as maintained by gnulib-tool.  Additionally, remove
  the directory `src/libs/gnulib/gltests' and the references to
  `gltests' in all files.

  (All of this could be done with a script, but I hope that this is
  eventually replaced with migrating groff as a whole to gnulib and
  its setup).

. Call

    gnulib-tool --add-import \
                --dir=src/libs/gnulib \
                wcwidth

  to update everything.

. Merge the changed, new, and deleted files into `gnulib.old',
  delete `gnulib', rename `gnulib.old' to `gnulib', then commit.

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