lynx-dev treated as error

[David Woolley]

This may have been fixed in the latest version, but it is sufficiently
obscure that it might not have been  (I'm using  2.8.1rel.2 (1998))...

In a recent highly obfuscated spam that I received, almost all the characters
where replaced by numeric entities.  These included the spaces, as  .
Lynx just output the entity code!

It looks like there might be a one out boundary error in the logic for
deciding when to decode entities.

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