Revert "LaTeX: extend to all projects the #3742 fix for PDF builds at RTD"

[jfbu]

This reverts commit 9b2aac6.

Relates

• LaTeX: #5181 workaround an RTD issue causes unexpected consequences #5238, LaTeX: extend to all projects the #3742 fix for PDF builds at RTD #5181
• PDF builds do not do enough pdflatex runs readthedocs/readthedocs.org#2857
• PDF builds should use Sphinx provided LaTeX Makefile which uses Latexmk (and possibly xindy) readthedocs/readthedocs.org#4454

[codecov]

Codecov Report

Merging #5239 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5239      +/-   ##
==========================================
+ Coverage   82.25%   82.26%   +0.01%     
==========================================
  Files         301      295       -6     
  Lines       39558    39221     -337     
  Branches     6078     6024      -54     
==========================================
- Hits        32537    32264     -273     
+ Misses       5687     5631      -56     
+ Partials     1334     1326       -8

Impacted Files	Coverage Δ
sphinx/writers/latex.py	84.02% <ø> (ø)	⬆️
sphinx/quickstart.py
sphinx/errors.py
sphinx/__init__.py
sphinx/search/__init__.py
sphinx/make_mode.py
sphinx/apidoc.py
sphinx/builders/html.py	82.81% <0%> (+0.09%)	⬆️

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[jfbu]

Thanks @tk0miya for quick review and sorry for oversight at #5181 that I did not think of projects without general index. Anyway, RTD policy of only two pdflatex runs and a hard-coded makeindex call causes problem also with xindy usage, so I hope they will use our Makefile and Latexmk, even though it basically means 3 pdflatex runs, but that's more or less unavoidable as latex is a multi-pass system.

Now merging.