New review comment by fosslinux on void-packages repository

https://github.com/void-linux/void-packages/pull/24300#discussion_r471052407

Comment:
The problem lies here in `texmf.cnf` and `tlmgr`. First, in `texmf.cnf`:

```
% ^L Part 1: Search paths and directories.

% This is the parent directory of our several trees, i.e.,
% /usr/local/texlive/YYYY in the original TeX Live distribution.
%
% The path definitions here assume the directories are organized
% according to the TeX Directory Structure (http://tug.org/tds).
%
% Redistributors will probably want $SELFAUTODIR/share, i.e., /usr/share.
% Kpathsea sets (in kpathsea/progname.c):
% SELFAUTOLOC (directory of the binary=/usr/local/texlive/YYYY/bin/i386-linux),
% SELFAUTODIR (its parent = /usr/local/texlive/YYYY/bin),
% SELFAUTOPARENT (its grandparent = /usr/local/texlive/YYYY), and
% SELFAUTOGRANDPARENT (its great-grandparent = /usr/local/texlive).
```

`tlmgr` has:
```
  if (-r "$bindir/$kpsewhichname") {
    # if not in bootstrapping mode => kpsewhich exists, so use it to get $Master
    chomp($Master = `kpsewhich -var-value=SELFAUTOPARENT`);
  }
```

Hence because `SELFAUTLOC=/usr/bin` `SELFAUTOPARENT=/` and so it adds `/tlpkg` and `/texmf-dist/scripts/texlive` to `@INC` and can't find anything. These variable definitions are hardcoded into kpathsea so they cannot be changed; `SELFAUTOPARENT` will always be `/`. So, the three options are a wrapper like this one, patching tlmgr to use `/usr/share/texmf-dist` as `$Master` or patching kpathsea. None of these are all that nice, IMHO.