[NTG-context] Install Tikz in LMTX tree

[Jorge Manuel]

Thanks to Hans Hagen.

\newcount\eTeXversion  \eTeXversion  = 2000
\newcount\eTeXrevision \eTeXrevision = 0020

In the top of my tex file fixed the problem.

Jorge

> On 10 Mar 2020, at 14:06, Hans Hagen <j.hagen at xs4all.nl> wrote:
> 
> On 3/10/2020 11:32 AM, Henri Menke wrote:
> 
>> There are still people trying to run TikZ on plain TeX with the Knuth
>> engine: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=920368
> 
> hm, so you can't actually use etex goodies unless you emulate them
> 
>>> \newcount\eTeXversion  \eTeXversion  = 2000
>>> \newcount\eTeXrevision \eTeXrevision = 0020
>> Hm, I need something that *all* eTeX engines provide that I can check.
>> And these seem to have met that requirement.  I really don't want to
>> write a huge cascade of if-s to test for different engines.
> 
> I'll add dummies then but be aware that you actually should test for the primitives that you expect because I'm not even sure if luatex bumped the number. As you mention "all" it means that you expect differences because "all" implies differences here. What if someone runs a very old (experimental) etex.
> 
> (\scantokens, \readline, \detokenize, \savingvdiscards are likely to be untouched .. it depends on what primitives you expect to use)
> 
> 
> Hans
> 
> 
> 
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