bug#547: 23.0.60; Euro symbol not displayed

[jasonr]

Quoting Stefan Monnier <monnier@IRO.UMontreal.CA>:

> >> €  <- This is the euro symbol, which is displayed as a box.
>
> Not sure if it is related, but under X11, I do see the euro displayed as
> a euro sign, but it uses -unknown-DejaVu
> Sans-normal-normal-semi-condensed-*-13-*-*-*-*-0-iso10646-1 even though
> my default font -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-*-*
> also includes a euro symbol.

In my case, with emacs -Q it is displayed by -outline-MS
Mincho-normal-normal-normal-mono-13-*-*-*-c-*-jisx0208*-* (#x00) which displays
a dot in its place. I notice this character has the dubious "category: c:Chinese
h:Korean j:Japanese" line when I press C-u C-x =, and the font log shows fonts
from the gb2312.1980, gbk and jisx0208 character sets being searched, which is
surely a bug, as the Euro is not present in those old character sets.

I think the underlying problem is that Emacs is still treating (symbol . [#x201C
#x2200 #x2500]) incorrectly - requiring all those characters to be supported
before it will use a font, not just one or two.