labs: sysdev-toolchain: Optionally remove --passive-ftp from wget flags

In Fedora, wget2 is now used in place of wget. wget2 doesn't support the
--passive-ftp option causing every download to failed.

Add explanations about this in the crosstool-ng configuration part.

Signed-off-by: Bastien Curutchet <[email protected]>

labs/sysdev-toolchain/sysdev-toolchain.tex

@@ -89,6 +89,10 @@ \section{Configure the toolchain to produce}
 In \code{Path and misc options}:
 \begin{itemize}
 \item If not set yet, enable \code{Try features marked as EXPERIMENTAL}
+\item In some distributions, \code{wget2} is used instead of \code{wget}.
+Since \code{wget2} doesn't support the passive-ftp option, you may need
+to remove the \code{--passive-ftp} flags from the
+\code{DOWNLOAD_WGET_OPTIONS}
 \end{itemize}
 
 \ifdefstring{\labboard}{stm32mp1}{