[tz] Non-ASCII chars in southamerica file

[Paul Eggert]

Thanks for catching these problems.  Two proposed patches
are attached.  The first fixes the problems by going back to ASCII.
The second puts in a check for this problem, so that non-ASCII
bytes like that don't slip into future releases.  At some point
we may well want to add non-ASCII characters, but they should
be UTF-8 I expect.  I've pushed these proposed patches into
the unofficial experimental repository at github.
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