[macros] Preserve straight apostrophes in code.

Apostrophes are code and should not be turned into typographic single quotes.

Author: tkoeppe

source/macros.tex

@@ -500,7 +500,7 @@
 \newcommand{\CodeBlockSetup}{%
 \lstset{escapechar=@, aboveskip=\parskip, belowskip=0pt,
         midpenalty=500, endpenalty=-50,
-        emptylinepenalty=-250, semicolonpenalty=0}%
+        emptylinepenalty=-250, semicolonpenalty=0,upquote=true}%
 \renewcommand{\tcode}[1]{\textup{\CodeStylex{##1}}}
 \renewcommand{\term}[1]{\textit{##1}}%
 \renewcommand{\grammarterm}[1]{\gterm{##1}}%