bug#31315: wrong font encoding for fallback font

[Werner LEMBERG]

>> You actually have found a font encoded in GB18030?  Which one?  I have
>> never seen that.
> 
> The same that you have plus two others.

But those fonts are *not* encoded in GB18030 at all.  It is the X11
font interface that provides GB18030 encoding access.

BTW, looking into my `/usr/share/fonts/encodings/large' directory, I
see a file `gb18030.2000-0.enc.gz', which contains only two-byte
entries.  In other words, it omits all three- and four-byte entries,
thus covering only a subset of GB18030.


    Werner