[vte] test: Add UTF-8 test

[Christian Persch <chpe src gnome org>]

commit 6caae8b8550f1bccae7819216d1f5626dfafb279
Author: Christian Persch <chpe src gnome org>
Date:   Tue Oct 15 21:39:15 2019 +0200

    test: Add UTF-8 test
    
    This is the "UTF-8 decoder capability and stress test" file from
    Markus Kuhn, modified to show the right margin correctly for a decoder
    conforming to the whatwg Encoding Standard spec (which vte's decoder
    does conform to).

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 perf/UTF-8-test.txt | Bin 0 -> 22687 bytes
 2 files changed, 154 insertions(+)
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diff --git a/COPYING.CC-BY-4-0 b/COPYING.CC-BY-4-0
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diff --git a/perf/UTF-8-test.txt b/perf/UTF-8-test.txt
new file mode 100644
index 00000000..db73cb79
Binary files /dev/null and b/perf/UTF-8-test.txt differ