scripts: sphinx-pre-install: add required ctex dependency

commit 7baab965896eaeea60a54b8fe742feea2f79060f upstream.

After a change meant to fix support for oriental characters
(Chinese, Japanese, Korean), ctex stylesheet is now a requirement
for PDF output.

Reported-by: Christoph Hellwig <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/165aa6167f21e3892a6e308688c93c756e94f4e0.1641243581.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

scripts/sphinx-pre-install

@@ -76,6 +76,7 @@ my %texlive = (
 	'ucs.sty'            => 'texlive-ucs',
 	'upquote.sty'        => 'texlive-upquote',
 	'wrapfig.sty'        => 'texlive-wrapfig',
+	'ctexhook.sty'       => 'texlive-ctex',
 );
 
 #