bug#73484: 31.0.50; Abolishing etags-regen-file-extensions

[Eli Zaretskii <eliz@gnu.org>]

> From: Francesco Potortì <pot@gnu.org>
> Date: Thu, 10 Oct 2024 03:39:47 +0200
> Cc: 73484@debbugs.gnu.org,
> 	spwhitton@spwhitton.name,
> 	Eli Zaretskii <eliz@gnu.org>
> 
> I have just written:
> >There are two O^2 test in the number of tags in C/C++ files which depend on the two options "no-line-directive" and "no-duplicates".  Both options are usable to disable those checks and both are off by default because they help producing a more sane tags file and have no practical impact in most cases.  Both are there because, in principle, they cause significant slowdown in huge tags files.
> 
> However, --no-line-directive exhibits the O^2 behaviour inthe number of tags only for languages with the "metafile" property, currently only yacc files.  Unless you have a significant number of yacc files, the impact is O^1 in the number of tag candidates.  And --no-duplicates only matters when creating a ctags file.
> 
> Maybe you could give a try and check whether --no-line-directives has any impact

I already did that: the effect is null and void.  Which is not a
surprise, since there are only 3 Yacc files in this tree.