X: Remove unneeded legacy fonts

> Xorg's ancestor (X11R1, in 1987) at first only provided bitmap fonts,
> with a tool (bdftopcf) to assist in their installation. With the
> introduction of xorg-server-1.19.0 and libXfont2 many people will not
> need them. There are still a few old packages which might require, or
> benefit from, these deprecated fonts and so the following packages are
> shown here.
>
> ### Note ###
>
> The font-adobe-100dpi package installs 100 dots per inch versions of
> Courier, Helvetica, New Century Schoolbook and Times fonts.
>
> The remaining font packages here provide 75dpi versions of those fonts,
> and various miscellaneous fonts - mostly for legacy encodings. Those are
> primarily to silence warnings when testing Xorg. In previous versions of
> BLFS a lot more legacy fonts were installed.
>
> Please consult the BLFS-7.10 book at
> http://www.linuxfromscratch.org/blfs/view/7.10/x/x7font.html if you wish
> to install any of those other fonts.

Compare the fonts [1][2], and only install the fonts listed in BLFS 8.0.

[1] http://www.linuxfromscratch.org/blfs/view/7.10/x/x7font.html
[2] http://www.linuxfromscratch.org/blfs/view/8.0/x/x7font.html