t1lib +psdoc: recursive dependency with texlive

[drkp (Dan Ports)]

t1lib's +psdoc variant depends on texlive to build documentation:

variant psdoc description {build and install the PostScript documentation} {
        depends_lib-append              bin:tex:texlive
        build.target                    all
}

texlive depends on t1lib (for texlive-bin).

Unless anyone has a better answer (t1lib is nomaintainer), I'll probably remove the psdoc variant.

[drkp (Dan Ports)]

Removed the variant in r69178