ctxdoc: update patch for `\MakeUppercase ` [ci skip]

[muzimuzhi]

Since LaTeX2e 2022-11-01, full expansion of \MakeUppercase{<text>} has been changed from \MakeUppercase {<text>} (single space in csname) to \MakeUppercase []{<text>} (three spaces in csname).

Then LaTeX2e 2023-06-01 improved it to be \MakeUppercase []{{... <text> ...}}.

The macro prefixes are kept and the extra group is restored for both versions.

See

• https://github.com/latex3/latex2e/commit/7447e931820114aa459e66b1a7937cdc9aebb0f4
• https://github.com/latex3/latex2e/commit/17ab93ac05095000ff43a79dd50f5ede994da0e6

---

ctxdoc.cls skips \MakeUppercase applied to section marks by letting (the full expansion form of) \MakeUppercase to the identity macro locally in \@thehead, so one can safely use

% \def\LuaLaTeX{\hologo{LuaLaTeX}}
\section{\LuaLaTeX{} ...}

But since LaTeX2e 2022-11-01, the full expansion form of \MakeUppercase has changed. This makes the existing patch no longer in effect, which resulting in the problem mentioned in #668: building ctex.pdf from ctex.dtx throws error(s)

! Package hologo Error: Unknown logo `LUALATEX'.

This PR extends the patch for \MakeUppercase to make the doc compile again.

[muzimuzhi]

An example to test (play with), since currently CI doesn't cover doc generation.

\documentclass{article}
\usepackage{etoolbox}

\makeatletter
\ifcsdef{MakeUppercase\space\space\space}
  {\preto\@thehead
    {\protected\long\csdef{MakeUppercase\space\space\space}[#1]#2{{#2}}}}
  {\preto\@thehead
    {\protected\long\csdef{MakeUppercase\space}#1{{#1}}}}
\makeatother

\pagestyle{headings}

\begin{document}
\section{Lua\LaTeX{}}
content
\end{document}