README: Updated to not point users at wineinstall and to mention fontforge

[Molle Bestefich]

> > echo "=media-gfx/fontforge-20060406" >> /etc/portage/package.keywords
>
> echo "media-gfx/fontforge ~x86" >> /etc/portage/package.keywords

Latter version is definitely preferable, as otherwise FontForge will
never again be upgraded (right?).