t9200: Re-code non-ascii path test in UTF-8

t9200: Re-code non-ascii path test in UTF-8

For the purpose of this test we do not really care if the paths
are in latin-1, but people on Cygwin seem to be having problem
on foreign-looking pathnames that do not play well with their
locale.

Let's try to re-code them in UTF-8 and see who screams,
thanks, or reports no-improvements.

Signed-off-by: Junio C Hamano <junkio@cox.net>