(setup-8-bit-environment): Function deleted.

(setup-8-bit-environment): Function deleted.
(setup-XXX-environment): Just call set-language-environment.  If
they used to do some other jobs than what done by
set-language-environment, those jobs are done in
setup-XXX-environment-internal now.
("LANUGAGE-ENVIRONMENT"): Delete property setup-function or change
the value to setup-XXX-environment-internal.  Add properties
nonascii-translation, input-method, features, unibyte-syntax, and
unibyte-display.