Description of Problem:
When Emacs is started in a locale that uses utf-8 encoding, it should
default to default to using utf-8 encoding for its buffers.

Version-Release number of selected component (if applicable):
emacs-21.2-18

How Reproducible:
every time

Steps to Reproduce:
1. LANG=en_US.utf-8 emacs

Actual Results:
Default encoding of buffers and files is latin-1 (iso8859-1).

Expected Results:
Default encoding should be utf-8, following the locale.

Additional Information:
(prefer-coding-system 'utf-8) can be used to make utf-8 the default
buffer/file encoding.  Of course this needs to be conditionalized on
a test that the locale is using a utf-8 encoding, particularly since
Emacs can currently handle CJK utf-8 afaik.