quick hack to make the old pubmats build (in buster chroot) c.p.

(without this, some have extra whitespace before listings leading
to erroneous page breaks)

teckids.sty

@@ -314,7 +314,7 @@
 	language=python,
 	basicstyle=\ttfamily,
 	upquote=true,
-	aboveskip={1.5\baselineskip},
+	aboveskip={\smallskipamount},
 	columns=fixed,
 	showstringspaces=false,
 	extendedchars=true,