groff_char.7 manpage broken

[joerg van den hoff]

this concerns the `groff' package: `man groff_char' is broken (again, I believe, after having worked 
correctly some time ago).

`man groff_char' first lists a bunch of `tbl' warnings and the then displayed manpage
does not display any of the tables supposed to give the overview of "available glyphs on the 
currently used output device" (terminal, usually, but possibly postscript). look, e.g. for 
"Ligatures and Other Latin Glyphs". does neither work for terminal output nor for postscript (`man -t').

this is on 10.15.7 with groff @1.22.4_6.