[vorbis-dev] bug fixes in vorbis-tools/share

[Edmund GRIMLEY EVANS]

Here's a patch to fix some bugs in my code, plus a header file I
probably forget to send in before.

* Missing header file charset.h. It's not needed outside
vorbis-tools/share, so I think it can live there.

* There was a minor bug in the UTF-8 decoder utf8_mbtowc().

* I've added some more tests in charset_test.c in an attempt to
convince myself that there aren't any more bugs.

* I've got rid of min from struct charset because the minimum is
always 1 in practice.

Edmund


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