New issue by 4ricci on void-packages repository

https://github.com/void-linux/void-packages/issues/28727

Description:
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### System

* xuname:  
Void 5.10.15_1 x86_64 GenuineIntel uptodate rrFFFFFFFFFFFFFFFFF

* package:  
  `texlive-ConTeXt-20200406_7`

### Expected behavior
`context --version` (from the texlive-ConTeXt package) should print something like this (obtained with the texlive-bin package):
```
mtx-context     | ConTeXt Process Management 1.03
mtx-context     |
mtx-context     | main context file: /opt/texlive/2020/texmf-dist/tex/context/base/mkiv/context.mkiv
mtx-context     | current version: 2020.03.10 14:44
mtx-context     | main context file: /opt/texlive/2020/texmf-dist/tex/context/base/mkiv/context.mkxl
mtx-context     | current version: 2020.03.10 14:44
```
### Actual behavior
If `texlive-LuaTeX` is not installed, it prints:
```
/usr/bin/env: ‘texlua’: No such file or directory
```

If `texlive-LuaTeX` is installed, it prints:
```
mtxrun          | unknown script 'context.lua' or 'mtx-context.lua'
```