FYI, test-strstr.c: trivial leak fix and update-copyright tweak

[Jim Meyering]

I've just pushed these two changes:

        test-strstr.c: avoid a trivial leak
        * tests/test-strstr.c (main): Free haystack.

        update-copyright: recognize groff's \(co marker
        * build-aux/update-copyright (circle_c_re): Also accept
        uses of \(co, as found in gzip.1.

0001-update-copyright-recognize-groff-s-co-marker.patch
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0002-test-strstr.c-avoid-a-trivial-leak.patch
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