bug#15656: preparing for the release, 4 maint+test patches

[Jim Meyering]

I'm going to push these shortly.  There will be at least one more to
sync with the latest gnulib.

0001-tests-add-a-test-for-better-coverage-of-some-tricky-.patch
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0002-maint-fix-typo-in-NEWS.patch

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0003-maint-update-bootstrap-to-latest-from-gnulib.patch

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0004-tests-extend-the-multibyte-white-space-test.patch

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