Following up to previous commit's TODO.

* filter.c (struct filter_par): wchar_t becomes wchli_t.

* lib.h (wchli_t): New type: an incomplete structure type,
so that a pointer to this type is incompatible with anything else.
(wli): Macro produces const wchli_t * pointer instead of
const wchar_t *.
(auto_str, static_str): Accept a const wchli_t * instead
of const wchar_t *, making it impossible to misuse these
functions by passing in a literal.

* stream.c (string_out_put_char): These type changes showed
this hack to have a bug. Confronted with the need to cast
from const wchar_t * to const wchli_t *, it's obvious that
the conversion has to be done properly with the + 1 in the
one platform case, but not the other.

* txr.c (version): Type changed to const wchli_t.

* txr.h (version): Declaration updated.

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