Embedded Linux labs: stop mentioning ddd

- Not updated since 2009
- We don't mention it anymore in our slides

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

labs/sysdev-application-debugging/sysdev-application-debugging.tex

@@ -124,9 +124,6 @@ \section{Using gdbserver}
 On the host side, run \code{arm-linux-gdb} (also found in your toolchain):
 \bashcmd{$ arm-linux-gdb vista-emulator}
 
-You can also start the debugger through the \code{ddd} interface:
-\bashcmd{$ ddd --debugger arm-linux-gdb vista-emulator}
-
 \code{gdb} starts and loads the debugging information from the
 \code{vista-emulator} binary that has been compiled with \code{-g}.