Don't generate BDF for non-default fonts.

The other widths will generate terrible bitmaps, so just don't bother.

Makefile

@@ -36,9 +36,14 @@ bedstead-ultracondensed.sfd: bedstead
 	./bedstead --ultra-condensed > bedstead-ultracondensed.sfd
 
 
-%.otf %-10.bdf %-20.bdf: %.sfd
+%-10.bdf %-20.bdf: %.sfd
 	fontforge -lang=ff \
 	    -c 'Open($$1); BitmapsAvail([10, 20]); Generate($$2, "bdf")' \
+	    $< $*.
+
+%.otf: %.sfd
+	fontforge -lang=ff \
+	    -c 'Open($$1); Generate($$2)' \
 	    $< $*.otf
 
 %.pfa %.afm: %.sfd