[Patch] multibyte encodings in strings

[m4tze@exitno.de]

Dear binutils team,

I am sending you a patch fixing an issue in the binary 'strings'.
The issue concerned finding multibyte encoded strings at odd offsets.

To test this issue try the following line

    echo "aa53007400720069006e0067003100aa53007400720069006e0067003200bb" | xxd -p -r | strings -el

Only the second string will be found.

The attached patch fixes this problem by doing only a single byte step if an
invalid character has been found.

Do not hesitate to contact me in case of questions or feedback.

Happy to contribute,

Mathias
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