Due to its roots in OS/2, JFS has always tried to convert pathnames
into unicode.  Unfortunately, it never had a reliable idea of what
the incoming character set was, so it defaulted to CONFIG_NLS_DEFAULT.

This behavior was confusing and many users have requested that JFS
have a more sane behavior.   This patch changes the default behavior
to store the incoming bytes directly without translation.  This is
consistent with the behavior when the default value of
CONFIG_NLS_DEFAULT (iso8859-1) was defined.  The default behavior
can be overridden by using the iocharset mount option.