Embedded Linux references: update book from Chris Simmonds

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

slides/sysdev-references/sysdev-references.tex

@@ -6,12 +6,11 @@ \section{References}
     \column{0.85\textwidth}
     \small
     \begin{itemize}
-    \item {\bf Mastering Embedded Linux, Second Edition, Packt
-      Publishing}\\
-      By Chris Simmonds, June 2017\\
+    \item {\bf Mastering Embedded Linux, Third Edition, Packt Publishing}\\
+      By Chris Simmonds, May 2021\\
       An up-to-date resource covering most aspects of embedded Linux
       development.\\
-      \url{https://bit.ly/2A9Pb5Y}
+      {\scriptsize \url{https://www.packtpub.com/product/mastering-embedded-linux-programming-third-edition/9781789530384}}
     \item The Linux Programming Interface, Oct 2010
       \begin{itemize}
       \item Michael Kerrisk, No Starch Press
@@ -22,11 +21,11 @@ \section{References}
       P. Raghavan, A. Lad, S. Neelakandan, Auerbach, Dec. 2005.
       Very good coverage of the POSIX programming API (still up
       to date).\\
-      \url{https://j.mp/19X8iu2}
+      {\scriptsize \url{https://www.amazon.com/Embedded-Linux-System-Design-Development/dp/0849340586}}
     \end{itemize}
     \normalsize
     \column{0.15\textwidth}
-    \includegraphics[height=0.25\textheight]{slides/sysdev-references/book-mastering-embedded-linux2.jpg}\\
+    \includegraphics[height=0.25\textheight]{slides/sysdev-references/book-mastering-embedded-linux3.jpg}\\
     \vspace{0.5cm}
     \includegraphics[height=0.25\textheight]{common/linux-programming-interface.png}\\
     \vspace{0.5cm}