Rework this port. Instead of patching the fonts, which come with gd to have
koi8-u support -- each patch was twice bigger than the font file, since they
had almost no identical lines -- provide our own complete replacements. This
port now depends on the fetch-target of x11-fonts/geminifonts and passes
the tarball name and the fonts files to the master-port through my new
GD_FONTS variable.