[tlbuild] dvi test?

[Karl Berry]

    pdftex is actually used in TeX Live 2021 for
    all jobs except plain TeX jobs. This change happened fairly recently;
    there was a time when the original TeX was used for LaTeX.

Apart from the whole (x)dvi thing, let me just clarify that:

1) it is true that the pdftex binary is currently used for "latex" (and
"pdflatex").

2) it is true that the tex binary was used for "latex" in the past.

3) the change from tex to pdftex happened in 2003,
according to the TL news.

karl