.FN!set-language-environment.FN" should set .FN!language-unicode-precedence-list.FN"

[Stephen J. Turnbull]

Mike FABIAN writes:

 > By the way, adding the charsets ‘latin-iso8859-13’ and
 > ‘latin-iso8859-16’ to the charset lists in the language-environments
 > gives an error during startup because these are apparently not yet
 > available when ‘finish-set-language-environment’ is called.

*sigh*

Just uncomment them in lisp/unicode.el.  I think it unlikely that
anything that doesn't need them will notice, while stuff like
`finish-set-language-environment' will work better.

That strategy would not necessarily work with non-ISO-2022-conforming
charsets such as Windows-1252, but fortunately ISO 8859 is a profile
of ISO 2022.  All that you lose by doing this is a few bytes, I think.